| 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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| acidophilus | (noun) a bacterium that is used to make yogurt and to supplement probiotics | Synonyms: Lactobacillus acidophilus |
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| acromphalus | (noun) abnormal protrusion of the navel; sometimes the start of umbilical hernia | - |
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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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| alveolus | (noun) a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways | Synonyms: air cell, air sac |
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| (noun) a bony socket in the alveolar ridge that holds a tooth | Synonyms: tooth socket |
| amorphophallus | (noun) any plant of the genus Amorphophallus | - |
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| angelus | (noun) the sound of a bell rung in Roman Catholic churches to announce the time when the Angelus should be recited | Synonyms: angelus bell |
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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 |
| astragalus | (noun) the bone in the ankle that articulates with the leg bones to form the ankle joint | Synonyms: anklebone, astragal, talus |
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| bacillus | (noun) aerobic rod-shaped spore-producing bacterium; often occurring in chainlike formations; found primarily in soil | Synonyms: B |
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| bolus | (noun) a large pill; used especially in veterinary medicine | - |
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| (noun) a small round soft mass (as of chewed food) | - |
| 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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| callus | (noun) (botany) an isolated thickening of tissue, especially a stiff protuberance on the lip of an orchid | - |
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| (noun) bony tissue formed during the healing of a fractured bone | - |
| (noun) an area of skin that is thick or hard from continual pressure or friction (as the sole of the foot) | Synonyms: callosity |
| 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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| coccobacillus | (noun) a bacterial cell intermediate in morphology between a coccus and a bacillus; a very short bacillus | - |
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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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| embolus | (noun) an abnormal particle (e.g. an air bubble or part of a clot) circulating in the blood | - |
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| entellus | (noun) langur of southern Asia; regarded as sacred in India | Synonyms: hanuman, Presbytes entellus, Semnopithecus entellus |
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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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| gallus | (noun) elastic straps that hold trousers up | Synonyms: brace, suspender |
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| gladiolus | (noun) the large central part of the breastbone | Synonyms: corpus sternum |
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| (noun) any of numerous plants of the genus Gladiolus native chiefly to tropical and South Africa having sword-shaped leaves and one-sided spikes of brightly colored funnel-shaped flowers; widely cultivated | Synonyms: glad, gladiola, sword lily |
| glomerulus | (noun) a small intertwined group of capillaries in the malpighian body; it filters the blood during urine formation | - |
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| hilus | (noun) (anatomy) a depression or fissure where vessels or nerves or ducts enter a bodily organ | Synonyms: hilum |
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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 | - |
| hydrocephalus | (noun) an abnormal condition in which cerebrospinal fluid collects in the ventricles of the brain; in infants it can cause abnormally rapid growth of the head and bulging fontanelles and a small face; in adults the symptoms are primarily neurological | Synonyms: hydrocephaly |
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| lactobacillus | (noun) a Gram-positive rod-shaped bacterium that produces lactic acid (especially in milk) | - |
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| leptocephalus | (noun) slender transparent larva of eels and certain fishes | - |
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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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| microcephalus | (noun) an abnormally small head and underdeveloped brain | Synonyms: microcephaly, nanocephaly |
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| microphallus | (noun) an abnormally small penis | Synonyms: micropenis |
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| modiolus | (noun) the central conical bony pillar of the cochlea | - |
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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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| nautilus | (noun) cephalopod of the Indian and Pacific oceans having a spiral shell with pale pearly partitions | Synonyms: chambered nautilus, pearly nautilus |
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| (noun) cephalopod mollusk of warm seas whose females have delicate papery spiral shells | Synonyms: Argonaut, Argonauta argo, paper nautilus |
| (noun) a submarine that is propelled by nuclear power | Synonyms: nuclear-powered submarine, nuclear submarine |
| nucellus | (noun) central part of a plant ovule; contains the embryo sac | - |
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| nucleolus | (noun) a small round body of protein in a cell nucleus; such organelles contain RNA and are involved in protein synthesis | Synonyms: nucleole |
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| obolus | (noun) a Greek unit of weight equal to one tenth of a gram | - |
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| ocellus | (noun) an eyelike marking (as on the wings of some butterflies); usually a spot of color inside a ring of another color | Synonyms: eyespot |
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| (noun) an eye having a single lens | Synonyms: simple eye, stemma |
| oculus | (noun) the organ of sight | Synonyms: eye, optic |
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| omphalus | (noun) a scar where the umbilical cord was attached | Synonyms: belly button, bellybutton, navel, omphalos, umbilicus |
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| overplus | (noun) extreme excess | Synonyms: embarrassment, plethora, superfluity |
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| peplus | (noun) a garment worn by women in ancient Greece; cloth caught at the shoulders and draped in folds to the waist | Synonyms: peplos, peplum |
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| phallus | (noun) the male sex organ | Synonyms: member, penis |
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| pilus | (noun) hairlike structure especially on the surface of a cell or microorganism | - |
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| (noun) any of the cylindrical filaments characteristically growing from the epidermis of a mammal | Synonyms: hair |
| plus | (noun) the arithmetic operation of summing; calculating the sum of two or more numbers | Synonyms: addition, summation |
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| (noun) a useful or valuable quality | Synonyms: asset |
| 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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| sphacelus | (noun) the localized death of living cells (as from infection or the interruption of blood supply) | Synonyms: gangrene, mortification, necrosis |
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| (noun) necrotic tissue; a mortified or gangrenous part or mass | Synonyms: gangrene, slough |
| stimulus | (noun) any stimulating information or event; acts to arouse action | Synonyms: input, stimulant, stimulation |
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| streptobacillus | (noun) any of various rod-shaped Gram-negative bacteria | - |
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| strobilus | (noun) cone-shaped mass of ovule- or spore-bearing scales or bracts | Synonyms: cone, strobile |
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| stylus | (noun) a pointed tool for writing or drawing or engraving | Synonyms: style |
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| (noun) a sharp pointed device attached to the cartridge of a record player | - |
| surplus | (noun) a quantity much larger than is needed | Synonyms: excess, nimiety, surplusage |
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| talus | (noun) the bone in the ankle that articulates with the leg bones to form the ankle joint | Synonyms: anklebone, astragal, astragalus |
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| (noun) a sloping mass of loose rocks at the base of a cliff | Synonyms: scree |
| thallus | (noun) a plant body without true stems or roots or leaves or vascular system; characteristic of the thallophytes | - |
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| thiobacillus | (noun) small rod-shaped bacteria living in sewage or soil and oxidizing sulfur | - |
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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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| villus | (noun) a minute hairlike projection on mucous membrane | - |
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| vitellus | (noun) nutritive material of an ovum stored for the nutrition of an embryo (especially the yellow mass of a bird or reptile egg) | Synonyms: yolk |
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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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