| abacus | (noun) a calculator that performs arithmetic functions by manually sliding counters on rods or in grooves | - |
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| (noun) a tablet placed horizontally on top of the capital of a column as an aid in supporting the architrave | - |
| arcus | (noun) a whitish deposit in the shape of an arc that is sometimes seen in the cornea | Synonyms: arcus senilis |
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| ascus | (noun) saclike structure in which ascospores are formed through sexual reproduction of ascomycetes | - |
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| autofocus | (noun) an optical device for focussing a camera or other instrument automatically | - |
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| caucus | (noun) a closed political meeting | - |
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| circus | (noun) a performance given by a traveling company of acrobats, clowns, and trained animals | - |
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| (noun) a frenetic disorganized (and often comic) disturbance suggestive of a large public entertainment | Synonyms: carnival |
| (noun) an arena consisting of an oval or circular area enclosed by tiers of seats and usually covered by a tent | - |
| (noun) (antiquity) an open-air stadium for chariot races and gladiatorial games | - |
| (noun) a travelling company of entertainers; including trained animals | - |
| coccus | (noun) any spherical or nearly spherical bacteria | Synonyms: cocci |
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| crocus | (noun) any of numerous low-growing plants of the genus Crocus having slender grasslike leaves and white or yellow or purple flowers; native chiefly to the Mediterranean region but widely cultivated | - |
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| cuscus | (noun) woolly-haired monkey-like arboreal marsupial of New Guinea and northern Australia | - |
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| diplococcus | (noun) Gram-positive bacteria usually occurring in pairs | - |
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| diplodocus | (noun) a huge quadrupedal herbivore with long neck and tail; of late Jurassic in western North America | - |
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| discus | (noun) a disk used in throwing competitions | Synonyms: saucer |
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| (noun) an athletic competition in which a disk-shaped object is thrown as far as possible | - |
| echinococcus | (noun) tapeworms whose larvae are parasitic in humans and domestic animals | - |
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| focus | (noun) maximum clarity or distinctness of an image rendered by an optical system | - |
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| (noun) maximum clarity or distinctness of an idea | - |
| (noun) the concentration of attention or energy on something | Synonyms: centering, centring, direction, focal point, focusing, focussing |
| (noun) a fixed reference point on the concave side of a conic section | - |
| (noun) a point of convergence of light (or other radiation) or a point from which it diverges | Synonyms: focal point |
| (noun) a central point or locus of an infection in an organism | Synonyms: focal point, nidus |
| (noun) special emphasis attached to something | Synonyms: stress |
| fucus | (noun) any member of the genus Fucus | - |
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| gonococcus | (noun) the pus-producing bacterium that causes gonorrhea | Synonyms: Neisseria gonorrhoeae |
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| hibiscus | (noun) any plant of the genus Hibiscus | - |
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| incus | (noun) a small bone in the middle ear between the malleus and the stapes | Synonyms: anvil |
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| iridoncus | (noun) swelling of the iris of the eye | - |
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| lemniscus | (noun) a bundle of sensory nerve fibers going to the thalamus | Synonyms: fillet |
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| locus | (noun) the set of all points or lines that satisfy or are determined by specific conditions | - |
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| (noun) the scene of any event or action (especially the place of a meeting) | Synonyms: locale, venue |
| (noun) the specific site of a particular gene on its chromosome | - |
| meniscus | (noun) (physics) the curved upper surface of a nonturbulent liquid in a vertical tube | - |
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| (noun) (optics) a lens that is concave on one side and convex on the other | - |
| (noun) (anatomy) a disk of cartilage that serves as a cushion between the ends of bones that meet at a joint | Synonyms: semilunar cartilage |
| mucus | (noun) protective secretion of the mucous membranes; in the gut it lubricates the passage of food and protects the epithelial cells; in the nose and throat and lungs it can make it difficult for bacteria to penetrate the body through the epithelium | Synonyms: mucous secretion |
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| pneumococcus | (noun) bacterium causing pneumonia in mice and humans | Synonyms: Diplococcus pneumoniae |
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| rudapithecus | (noun) fossil hominoids from northern central Hungary; late Miocene | Synonyms: Dryopithecus Rudapithecus hungaricus |
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| staphylococcus | (noun) spherical Gram-positive parasitic bacteria that tend to form irregular colonies; some cause boils or septicemia or infections | Synonyms: staph, staphylococci |
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| streptococcus | (noun) spherical Gram-positive bacteria occurring in pairs or chains; cause e.g. scarlet fever and tonsillitis | Synonyms: strep, streptococci |
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| succus | (noun) any of several liquids of the body | Synonyms: juice |
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| sulcus | (noun) (anatomy) any of the narrow grooves in an organ or tissue especially those that mark the convolutions on the surface of the brain | - |
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| umbilicus | (noun) a scar where the umbilical cord was attached | Synonyms: belly button, bellybutton, navel, omphalos, omphalus |
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| uncus | (noun) (biology) any hook-shaped process or part | - |
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| viaticus | (noun) purchasing insurance policies for cash from terminally ill policy holders | Synonyms: viatication |
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| viscus | (noun) a main organ that is situated inside the body | Synonyms: internal organ |
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