Definition of umbo in English:

umbo

nounPlural umbos, Plural umbones ˈʌmbəʊˈəmboʊ

1historical The central boss of a shield.
Example sentencesExamples
- The nearly spherical cones have eight to 10 scales, each looking like a shield with a central projection (called an umbo, if you want to impress your botanist or Scrabble-playing friends).
2Biology
A rounded knob or protuberance.
Synonyms
lump, bump, protuberance, projection, protrusion, bulge, swelling, knot, node, nodule, gnarl, growth, outgrowth, excrescence, carbuncle, tumour
1. 2.1Zoology The highest point of each valve of a bivalve shell.
  Example sentencesExamples
  Below the umbones, the shell margin is folded inward forming a deep lunula and gaping between both valves.
  In contrast, a strongly obtuse apical angle is associated with an incurved ventral beak that is appressed to the dorsal umbo, resulting in the delthyrium being partly obscured.
  The new species is characterized by a transversely extended, strongly biconvex to globular shell with prominent umbones, relatively numerous costae and a notothyrial cavity supported dorsally by a short median ridge.
  Argonauta attaches the egg-mass to the umbo of the shell near the dorsal arms, not in the mantle cavity or posterior parts of the shell.
  The oldest part of the shell, the umbo, can be recognized as a large hump on the anterior end of the dorsal side of each shell.
2. 2.2Botany A central swelling on the cap of a mushroom or toadstool.

Derivatives

umbonal

adjective ʌmˈbəʊnlˌəmˈboʊnl

Zoology

Relating to or of the nature of an umbo or rounded protruberance.
the species lacks a prominent umbonal ridge
Example sentencesExamples
- Hinge articulation either limited to overlapping shell margins on dorsal side of byssal invagination or consisting of a transposable tooth and socket developed on the umbonal septum.
- Cyzicus having elongate valves; umbo convex; dorsal margin straight; posterior margin slightly flared; growth bands widely spaced in umbonal region, more closely spaced elsewhere.
- The umbonal angle narrows while the shape remains mytiliform and the ‘lunule’ (byssal invagination) remains shallow.

umbonate

adjective ˈʌmbəneɪtˈʌmbənət

Botany

Having a rounded knob or protuberance.
the figures show an umbonate form
Example sentencesExamples
- M. oreades has a white spore print, adnate, adnexed or even free gills usually white to pale tan in colour, a mid-sized bell-shaped cap but can later become umbonate as it ages.
- An umbonate colony is elevated more in the center of the colony than the rise across the surface of the colony.
- Other decorative British products of this period include ‘umbonate’ disc brooches.

Origin

Early 18th century: from Latin, 'shield boss'.

Rhymes

Colombo, dumbo, gumbo, jumbo, mumbo-jumbo

Definition of umbo in US English:

umbo

nounˈəmboʊˈəmbō

1historical The central boss of a shield.
Example sentencesExamples
- The nearly spherical cones have eight to 10 scales, each looking like a shield with a central projection (called an umbo, if you want to impress your botanist or Scrabble-playing friends).
2Biology
A rounded knob or protuberance.
Synonyms
lump, bump, protuberance, projection, protrusion, bulge, swelling, knot, node, nodule, gnarl, growth, outgrowth, excrescence, carbuncle, tumour
1. 2.1Zoology The highest point of each valve of a bivalve shell.
  Example sentencesExamples
  The oldest part of the shell, the umbo, can be recognized as a large hump on the anterior end of the dorsal side of each shell.
  Below the umbones, the shell margin is folded inward forming a deep lunula and gaping between both valves.
  In contrast, a strongly obtuse apical angle is associated with an incurved ventral beak that is appressed to the dorsal umbo, resulting in the delthyrium being partly obscured.
  The new species is characterized by a transversely extended, strongly biconvex to globular shell with prominent umbones, relatively numerous costae and a notothyrial cavity supported dorsally by a short median ridge.
  Argonauta attaches the egg-mass to the umbo of the shell near the dorsal arms, not in the mantle cavity or posterior parts of the shell.
2. 2.2Botany A central swelling on the cap of a mushroom or toadstool.

Origin

Early 18th century: from Latin, ‘shield boss’.

单词	umbo
释义	Definition of umbo in English: umbo nounPlural umbos, Plural umbones ˈʌmbəʊˈəmboʊ 1historical The central boss of a shield. Example sentencesExamples The nearly spherical cones have eight to 10 scales, each looking like a shield with a central projection (called an umbo, if you want to impress your botanist or Scrabble-playing friends). 2Biology A rounded knob or protuberance. Synonyms lump, bump, protuberance, projection, protrusion, bulge, swelling, knot, node, nodule, gnarl, growth, outgrowth, excrescence, carbuncle, tumour 2.1Zoology The highest point of each valve of a bivalve shell. Example sentencesExamples Below the umbones, the shell margin is folded inward forming a deep lunula and gaping between both valves. In contrast, a strongly obtuse apical angle is associated with an incurved ventral beak that is appressed to the dorsal umbo, resulting in the delthyrium being partly obscured. The new species is characterized by a transversely extended, strongly biconvex to globular shell with prominent umbones, relatively numerous costae and a notothyrial cavity supported dorsally by a short median ridge. Argonauta attaches the egg-mass to the umbo of the shell near the dorsal arms, not in the mantle cavity or posterior parts of the shell. The oldest part of the shell, the umbo, can be recognized as a large hump on the anterior end of the dorsal side of each shell. 2.2Botany A central swelling on the cap of a mushroom or toadstool. Derivatives umbonal adjective ʌmˈbəʊnlˌəmˈboʊnl Zoology Relating to or of the nature of an umbo or rounded protruberance. the species lacks a prominent umbonal ridge Example sentencesExamples Hinge articulation either limited to overlapping shell margins on dorsal side of byssal invagination or consisting of a transposable tooth and socket developed on the umbonal septum. Cyzicus having elongate valves; umbo convex; dorsal margin straight; posterior margin slightly flared; growth bands widely spaced in umbonal region, more closely spaced elsewhere. The umbonal angle narrows while the shape remains mytiliform and the ‘lunule’ (byssal invagination) remains shallow. umbonate adjective ˈʌmbəneɪtˈʌmbənət Botany Having a rounded knob or protuberance. the figures show an umbonate form Example sentencesExamples M. oreades has a white spore print, adnate, adnexed or even free gills usually white to pale tan in colour, a mid-sized bell-shaped cap but can later become umbonate as it ages. An umbonate colony is elevated more in the center of the colony than the rise across the surface of the colony. Other decorative British products of this period include ‘umbonate’ disc brooches. Origin Early 18th century: from Latin, 'shield boss'. Rhymes Colombo, dumbo, gumbo, jumbo, mumbo-jumbo Definition of umbo in US English: umbo nounˈəmboʊˈəmbō 1historical The central boss of a shield. Example sentencesExamples The nearly spherical cones have eight to 10 scales, each looking like a shield with a central projection (called an umbo, if you want to impress your botanist or Scrabble-playing friends). 2Biology A rounded knob or protuberance. Synonyms lump, bump, protuberance, projection, protrusion, bulge, swelling, knot, node, nodule, gnarl, growth, outgrowth, excrescence, carbuncle, tumour 2.1Zoology The highest point of each valve of a bivalve shell. Example sentencesExamples The oldest part of the shell, the umbo, can be recognized as a large hump on the anterior end of the dorsal side of each shell. Below the umbones, the shell margin is folded inward forming a deep lunula and gaping between both valves. In contrast, a strongly obtuse apical angle is associated with an incurved ventral beak that is appressed to the dorsal umbo, resulting in the delthyrium being partly obscured. The new species is characterized by a transversely extended, strongly biconvex to globular shell with prominent umbones, relatively numerous costae and a notothyrial cavity supported dorsally by a short median ridge. Argonauta attaches the egg-mass to the umbo of the shell near the dorsal arms, not in the mantle cavity or posterior parts of the shell. 2.2Botany A central swelling on the cap of a mushroom or toadstool. Origin Early 18th century: from Latin, ‘shield boss’.
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