| acervulus | (noun) small asexual fruiting body resembling a cushion or blister consisting of a mat of hyphae that is produced on a host by some fungi | - |
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| 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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| altocumulus | (noun) a cumulus cloud at an intermediate altitude of 2 or 3 miles | Synonyms: altocumulus cloud |
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| amatungulu | (noun) very large closely branched South African shrub having forked bright green spines and shiny leaves | Synonyms: Carissa grandiflora, Carissa macrocarpa, natal plum |
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| animalculum | (noun) microscopic organism such as an amoeba or paramecium | Synonyms: animalcule |
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| annulus | (noun) (Fungi) a remnant of the partial veil that in mature mushrooms surrounds the stem like a collar | Synonyms: skirt |
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| (noun) a toroidal shape | Synonyms: anchor ring, doughnut, halo, ring |
| calculus | (noun) the branch of mathematics that is concerned with limits and with the differentiation and integration of functions | Synonyms: infinitesimal calculus |
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| (noun) a hard lump produced by the concretion of mineral salts; found in hollow organs or ducts of the body | Synonyms: concretion |
| (noun) an incrustation that forms on the teeth and gums | Synonyms: tartar, tophus |
| caliculus | (noun) a small cup-shaped structure (as a taste bud or optic cup or cavity of a coral containing a polyp) | Synonyms: calycle, calyculus |
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| calyculus | (noun) a small cup-shaped structure (as a taste bud or optic cup or cavity of a coral containing a polyp) | Synonyms: caliculus, calycle |
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| (noun) a group of bracts simulating a calyx as in a carnation or hibiscus | Synonyms: calycle, epicalyx, false calyx |
| canaliculus | (noun) a small canal or duct as in some bones and parts of plants | - |
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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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| cirrocumulus | (noun) a cloud at a high altitude consisting of a series of regularly arranged small clouds resembling ripples | Synonyms: cirrocumulus cloud |
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| coagulum | (noun) a lump of material formed from the content of a liquid | Synonyms: clot |
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| convolvulus | (noun) any of numerous plants of the genus Convolvulus | - |
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| cumulus | (adjective) of or related to cumulous clouds | Synonyms: cumulous |
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| (noun) a collection of objects laid on top of each other | Synonyms: agglomerate, cumulation, heap, mound, pile |
| (noun) a globular cloud | Synonyms: cumulus cloud |
| 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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| ductulus | (noun) a very small duct | Synonyms: ductule |
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| famulus | (noun) a close attendant (as to a scholar) | - |
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| fasciculus | (noun) a bundle of fibers (especially nerve fibers) | Synonyms: fascicle, fiber bundle, fibre bundle |
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| funiculus | (noun) any of several body structure resembling a cord | - |
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| (noun) the stalk of a plant ovule or seed | Synonyms: funicle |
| galbulus | (noun) the seed-producing cone of a cypress tree | - |
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| glomerulus | (noun) a small intertwined group of capillaries in the malpighian body; it filters the blood during urine formation | - |
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| homunculus | (noun) a person who is very small but who is not otherwise deformed or abnormal | Synonyms: manikin, mannikin |
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| (noun) a tiny fully formed individual that (according to the discredited theory of preformation) is supposed to be present in the sperm cell | - |
| 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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| loculus | (noun) a small cavity or space within an organ or in a plant or animal | Synonyms: locule |
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| lulu | (noun) a very attractive or seductive looking woman | Synonyms: beauty, dish, knockout, looker, mantrap, peach, ravisher, smasher, stunner, sweetheart |
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| modulus | (noun) (physics) a coefficient that expresses how much of a specified property is possessed by a specified substance | - |
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| (noun) the absolute value of a complex number | - |
| (noun) an integer that can be divided without remainder into the difference between two other integers | - |
| musculus | (noun) one of the contractile organs of the body | Synonyms: muscle |
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| oculus | (noun) the organ of sight | Synonyms: eye, optic |
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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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| precalculus | (noun) a college-level algebra and trigonometry course that is designed to prepare students for the study of calculus | Synonyms: precalc |
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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) | - |
| rivulus | (noun) found in small streams of tropical America; often kept in aquariums; usually hermaphroditic | - |
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| sacculus | (noun) a small sac or pouch (especially the smaller chamber of the membranous labyrinth) | Synonyms: saccule |
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| 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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| stimulus | (noun) any stimulating information or event; acts to arouse action | Synonyms: input, stimulant, stimulation |
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| tumulus | (noun) (archeology) a heap of earth placed over prehistoric tombs | Synonyms: barrow, burial mound, grave mound |
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| ululate | (verb) emit long loud cries | Synonyms: howl, roar, wail, yaup, yawl |
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| ululation | (noun) a long loud emotional utterance | Synonyms: howl, howling |
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| utriculus | (noun) a small pouch into which the semicircular canals open | Synonyms: utricle |
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| ventriculus | (noun) thick-walled muscular pouch below the crop in many birds and reptiles for grinding food | Synonyms: gastric mill, gizzard |
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| volvulus | (noun) abnormal twisting of the intestines (usually in the area of the ileum or sigmoid colon) resulting in intestinal obstruction | - |
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