| 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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| altocumulus | (noun) a cumulus cloud at an intermediate altitude of 2 or 3 miles | Synonyms: altocumulus cloud |
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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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| 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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| convolvulus | (noun) any of numerous plants of the genus Convolvulus | - |
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| cumulus | (noun) a collection of objects laid on top of each other | Synonyms: agglomerate, cumulation, heap, mound, pile |
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| (noun) a globular cloud | Synonyms: cumulus cloud |
| 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 | - |
| loculus | (noun) a small cavity or space within an organ or in a plant or animal | Synonyms: locule |
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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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| 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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| 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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| 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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| 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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