Definition of columella in English:

columella

nounPlural columellae ˌkɒljʊˈmɛləˌkäl(y)əˈmelə

1Zoology
An ossicle (small bone) of the middle ear of birds, reptiles, and amphibians.
Example sentencesExamples
- In amphibians, the columella shares the oval window with a second bone, the operculum, which communicates by way of an opercular muscle with the pectoral girdle.
- A reduced hyomandibula associated with the quadrate in a fish's visceral skull evolved to form the ear ossicle called the stapes, or columella.
- Sound is conducted through the middle ear via the stapes or columella (both are ear ossicles derived from the hyomandibular).
1. 1.1Anatomy The pillar around which the cochlea spirals.
2Zoology
The axis of a spiral shell.
Example sentencesExamples
- Higher values mean tube of the shell forms further from the coiling axis, resulting in a wider columella or hollow center
- On most specimens, the very thin columella in the median part of the shell is either broken or missing (probably resorbed).
- It appears to be cut from a large bivalve and does not have the twisted shape of a whelk or conch columella.
- The attachment site of the large Crepidula on the ventral side of the host shell and the presence of algal or sponge borings through the columella of the host indicate that the Oliva shell was possibly occupied by a hermit crab.
3Botany
The axis of the spore-producing body of some lower plants.
Example sentencesExamples
- The stapes has neither a columella nor a stapedial foramen.
- In maize, endodermal cells are also involved in lateral root formation, giving rise to the newly formed epidermis and columella, while the remaining root-types are formed by the pericycle.
- The primary, stout capillitial branches arise from the upper part of the columella, dichotomously branching into flexuose threads.

Derivatives

columellar

adjective

It differs from the Austrian species by having weaker columellar folds.
Example sentencesExamples
- It is characterized by strong, rounded, axial ribs, fine spinelets at the intersection of axial ribs and sharp spiral cords, subsutural cord, strong simple spiral cords, and an apparently smooth, glazed columellar lip.
- Zigzag chevrons also occur within the axial columella, generally in two or three parallel rows that may be confined to particular growth bands, thus defining layers in columellar stereoplasm.
- Most tip plasty and nasal width reduction surgery do not have external scars except for the columellar in an open rhinoplasty approach, and tiny skin puncture marks for external osteotomies (bone breaking to narrow nose).
- Three beautiful specimens are assigned to this new species, which is characterized by step-like whorls, coarse and prominent collabral costae and spiral caring on the ramp, and a columellar lip with two folds.

Origin

Late 16th century: from Latin, 'small column'.

Definition of columella in US English:

columella

nounˌkäl(y)əˈmelə

1Zoology
An ossicle of the middle ear of birds, reptiles, and amphibians.
Example sentencesExamples
- In amphibians, the columella shares the oval window with a second bone, the operculum, which communicates by way of an opercular muscle with the pectoral girdle.
- Sound is conducted through the middle ear via the stapes or columella (both are ear ossicles derived from the hyomandibular).
- A reduced hyomandibula associated with the quadrate in a fish's visceral skull evolved to form the ear ossicle called the stapes, or columella.
1. 1.1Anatomy The pillar around which the cochlea spirals.
2Zoology
The axis of a spiral shell.
Example sentencesExamples
- Higher values mean tube of the shell forms further from the coiling axis, resulting in a wider columella or hollow center
- On most specimens, the very thin columella in the median part of the shell is either broken or missing (probably resorbed).
- It appears to be cut from a large bivalve and does not have the twisted shape of a whelk or conch columella.
- The attachment site of the large Crepidula on the ventral side of the host shell and the presence of algal or sponge borings through the columella of the host indicate that the Oliva shell was possibly occupied by a hermit crab.
3Botany
The axis of the spore-producing body of some lower plants.
Example sentencesExamples
- The primary, stout capillitial branches arise from the upper part of the columella, dichotomously branching into flexuose threads.
- In maize, endodermal cells are also involved in lateral root formation, giving rise to the newly formed epidermis and columella, while the remaining root-types are formed by the pericycle.
- The stapes has neither a columella nor a stapedial foramen.

Origin

Late 16th century: from Latin, ‘small column’.

单词	columella
释义	Definition of columella in English: columella nounPlural columellae ˌkɒljʊˈmɛləˌkäl(y)əˈmelə 1Zoology An ossicle (small bone) of the middle ear of birds, reptiles, and amphibians. Example sentencesExamples In amphibians, the columella shares the oval window with a second bone, the operculum, which communicates by way of an opercular muscle with the pectoral girdle. A reduced hyomandibula associated with the quadrate in a fish's visceral skull evolved to form the ear ossicle called the stapes, or columella. Sound is conducted through the middle ear via the stapes or columella (both are ear ossicles derived from the hyomandibular). 1.1Anatomy The pillar around which the cochlea spirals. 2Zoology The axis of a spiral shell. Example sentencesExamples Higher values mean tube of the shell forms further from the coiling axis, resulting in a wider columella or hollow center On most specimens, the very thin columella in the median part of the shell is either broken or missing (probably resorbed). It appears to be cut from a large bivalve and does not have the twisted shape of a whelk or conch columella. The attachment site of the large Crepidula on the ventral side of the host shell and the presence of algal or sponge borings through the columella of the host indicate that the Oliva shell was possibly occupied by a hermit crab. 3Botany The axis of the spore-producing body of some lower plants. Example sentencesExamples The stapes has neither a columella nor a stapedial foramen. In maize, endodermal cells are also involved in lateral root formation, giving rise to the newly formed epidermis and columella, while the remaining root-types are formed by the pericycle. The primary, stout capillitial branches arise from the upper part of the columella, dichotomously branching into flexuose threads. Derivatives columellar adjective It differs from the Austrian species by having weaker columellar folds. Example sentencesExamples It is characterized by strong, rounded, axial ribs, fine spinelets at the intersection of axial ribs and sharp spiral cords, subsutural cord, strong simple spiral cords, and an apparently smooth, glazed columellar lip. Zigzag chevrons also occur within the axial columella, generally in two or three parallel rows that may be confined to particular growth bands, thus defining layers in columellar stereoplasm. Most tip plasty and nasal width reduction surgery do not have external scars except for the columellar in an open rhinoplasty approach, and tiny skin puncture marks for external osteotomies (bone breaking to narrow nose). Three beautiful specimens are assigned to this new species, which is characterized by step-like whorls, coarse and prominent collabral costae and spiral caring on the ramp, and a columellar lip with two folds. Origin Late 16th century: from Latin, 'small column'. Definition of columella in US English: columella nounˌkäl(y)əˈmelə 1Zoology An ossicle of the middle ear of birds, reptiles, and amphibians. Example sentencesExamples In amphibians, the columella shares the oval window with a second bone, the operculum, which communicates by way of an opercular muscle with the pectoral girdle. Sound is conducted through the middle ear via the stapes or columella (both are ear ossicles derived from the hyomandibular). A reduced hyomandibula associated with the quadrate in a fish's visceral skull evolved to form the ear ossicle called the stapes, or columella. 1.1Anatomy The pillar around which the cochlea spirals. 2Zoology The axis of a spiral shell. Example sentencesExamples Higher values mean tube of the shell forms further from the coiling axis, resulting in a wider columella or hollow center On most specimens, the very thin columella in the median part of the shell is either broken or missing (probably resorbed). It appears to be cut from a large bivalve and does not have the twisted shape of a whelk or conch columella. The attachment site of the large Crepidula on the ventral side of the host shell and the presence of algal or sponge borings through the columella of the host indicate that the Oliva shell was possibly occupied by a hermit crab. 3Botany The axis of the spore-producing body of some lower plants. Example sentencesExamples The primary, stout capillitial branches arise from the upper part of the columella, dichotomously branching into flexuose threads. In maize, endodermal cells are also involved in lateral root formation, giving rise to the newly formed epidermis and columella, while the remaining root-types are formed by the pericycle. The stapes has neither a columella nor a stapedial foramen. Origin Late 16th century: from Latin, ‘small column’.
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