| acetabulum | (noun) the cup-shaped hollow in the hipbone into which the head of the femur fits to form a ball-and-socket joint | Synonyms: cotyloid cavity |
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| animalculum | (noun) microscopic organism such as an amoeba or paramecium | Synonyms: animalcule |
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| capitulum | (noun) a dense cluster of flowers or foliage | Synonyms: head |
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| (noun) fruiting spike of a cereal plant especially corn | Synonyms: ear, spike |
| (noun) an arrangement of leafy branches forming the top or head of a tree | - |
| cingulum | (noun) (anatomy) an encircling structure (as the ridge around the base of a tooth) | - |
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| coagulum | (noun) a lump of material formed from the content of a liquid | Synonyms: clot |
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| curriculum | (noun) an integrated course of academic studies | Synonyms: course of study, program, programme, syllabus |
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| diverticulum | (noun) a herniation through the muscular wall of a tubular organ (especially the colon) | - |
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| infundibulum | (noun) any of various funnel-shaped parts of the body (but especially the hypophyseal stalk) | - |
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| inoculum | (noun) a substance (a virus or toxin or immune serum) that is introduced into the body to produce or increase immunity to a particular disease | Synonyms: inoculant |
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| operculum | (noun) a hard flap serving as a cover for (a) the gill slits in fishes or (b) the opening of the shell in certain gastropods when the body is retracted | - |
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| ossiculum | (noun) a small bone; especially one in the middle ear | Synonyms: bonelet, ossicle |
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| pabulum | (noun) insipid intellectual nourishment | - |
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| (noun) any substance that can be used as food | Synonyms: comestible, eatable, edible, victual, victuals |
| pendulum | (noun) an apparatus consisting of an object mounted so that it swings freely under the influence of gravity | - |
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| reticulum | (noun) the second compartment of the stomach of a ruminant | Synonyms: second stomach |
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| (noun) any fine network (especially one in the body composed of cells or blood vessels) | - |
| speculum | (noun) a medical instrument for dilating a bodily passage or cavity in order to examine the interior | - |
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| (noun) a mirror (especially one made of polished metal) for use in an optical instrument | - |
| spiculum | (noun) small pointed structure serving as a skeletal element in various marine and freshwater invertebrates e.g. sponges and corals | Synonyms: spicule |
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