A natural hollow or indentation on a surface of the body or of an organ, plant or plant part, etc.; (esp. in early use) spec. †a dimple (obsolete)…

A deep hollow or cavity in the surface of the body; e.g. an eye-socket. Cf. armhole, n.

Biology. Any of various larger chambers in the structure of a tissue or organism, typically with known functions. Now largely disused, except in B…

Anatomy. A cavity or hollow. Obsolete.

Surgery and Anatomy. Originally: a layer of tissue surrounding an abscess, cyst, or tumour. In later use also: a sac-like organ, esp. the gall…

Biology. More generally: a natural receptacle in an animal (or plant) resembling a bag or pocket, as a pouch, a marsupium, a cyst, an ovicapsule, etc.

Any of various sacs or pouch-like cavities in the body of an animal or in a plant. Now chiefly Zoology.

A shallow depression, hollow, or cavity in a surface of the body, an organ, etc. Frequently with distinguishing word(s).

= cyst, n.

Something resembling a trench. Anatomy and Zoology. A cavity, pit, or groove; a fossa. Now rare.

= conceptacle, n. 1a.

A bladder-like vessel or formation; a vesicle.

Anatomy and Zoology. A small bladder-like vessel in an animal body; a cavity or cell with a membranous integument; a small sac or cyst.

Anatomy. One or other of certain concave structures or surfaces normally facing downwards.

Anatomy. A hollow or cavity in which some part or articulation (as a tooth, eye, bone, etc.) is inserted.

A small bladder; a vesicle.

Applied to a cavity, or vessel in an organism; formerly esp. to the fourth ventricle of the brain.

Applied to the cavity of the ear, the frontal sinus, etc.; also to interstices between particles. Obsolete.

Any small hollow or cavity in an animal body, serving as a place of organic function; in later use, the recess or space between the true and false…

A membranous bag in the animal body. Any membranous bag in the animal body; usually with distinctive adjunct, as gall bladder, air bladder, swimming-b…

Anatomy. Any of various hollow cavities or structures within the body; esp. the pyloric antrum.

= conceptacle, n. (in various senses).

Physiology. A membranous integument or envelope; a bag or sac. capsule of Tenon n. Tenon's capsule (Tenonian adj. at Tenon, n.2 derivatives).

Biology. A small space, cavity, or sac in an organism or natural product (cf. cell, n.1 8 9). Also: a cell (cell, n.1 15) (rare).

Zoology, Anatomy, and Botany. A small cavity or chamber within a structure, often one of several which may be separated from each other by septa, esp.…

Anatomy. A natural hole, cell, or cavity in the substance of a bone or other tissue, and either closed or having a relatively small opening.

= vesicle, n. 1. Usually in plural.

Anatomy. A bladder.

Anatomy and Zoology. = fossa, n.1 Obsolete.

Medicine. An abnormal or artificially created structure or space in the body that resembles a bag or pocket; an aneurysm, a cyst (now rare); a sac…

Biology. A thin-walled hollow organ or cavity in an animal body (or plant) containing a liquid secretion; a bladder, sac, vesicle.

Biology. In an animal or plant: any chamber or cavity filled with air or gas; esp. each of the gas-filled chambers in the shell of a cephalopod.

Anatomy and Zoology. A small depression or cavity, esp. on the surface of a structure; a small fossa.

= alveolus, n. (in various senses).

Biology. Any natural bag-like cavity with its membranous covering in an animal or vegetable organism. in animal bodies. laryngeal sacs…

Anatomy, Biology. A small sac; a pouch-like dilatation of an organ.

= loculus, n. 2.

A space or chamber partitioned off. in the body of an animal or plant.

Zoology and Anatomy. A specialized air-filled cavity within the body. Cf. air sac n. at air, n.1 compounds 2.

A fossula (in various senses).

A small depression or hollow suggestive of a navel. (Chiefly in special applications.)

Botany and Mycology. In some lower plants and fungi: a cavity-like organ containing reproductive organs or cells; esp. the antheridia and oogonia of…

Any cavity of the body, as the abdominal cavity or a ventricle of the brain.

Anatomy and Biology. A small cell, sac, or bladder-like process.

a specialized air-filled cavity in the body of an animal; esp. an alveolus in the lung; cf. air cell, n. 1a.

A small sac, cyst, or bag; esp. the smaller of the two vesicles or sacs in the membranous vestibule of the internal ear.

Biol. Any vessel shaped like the ancient ampulla; the dilated end of any vessel, canal, or duct in an animal; the spongiole of a root in plants.

A small cavity or vesicle in organic tissue or protoplasm, frequently containing some fluid.

A small pit or depression; spec. the smooth area around the tubercles of a sea-urchin.

A small depression, like a cell of a honeycomb.