| acicula | (noun) a needlelike part or structure of a plant or animal or crystal; as a spine or bristle or crystal | - |
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| auricula | (noun) a pouch projecting from the top front of each atrium of the heart | Synonyms: auricular appendage, auricular appendix |
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| (noun) yellow-flowered primrose native to Alps; commonly cultivated | Synonyms: bear's ear, Primula auricula |
| buccula | (noun) a fold of fatty tissue under the chin | Synonyms: double chin |
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| caruncula | (noun) an outgrowth on a plant or animal such as a fowl's wattle or a protuberance near the hilum of certain seeds | Synonyms: caruncle |
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| cuticula | (noun) the outer body wall of an insect | - |
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| facula | (noun) a large bright spot on the sun's photosphere occurring most frequently in the vicinity of sunspots | Synonyms: solar facula |
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| (noun) a bright spot on a planet | - |
| fecula | (noun) excreta (especially of insects) | - |
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| furcula | (noun) a forked bone formed by the fusion of the clavicles of most birds | - |
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| macula | (noun) a small yellowish central area of the retina that is rich in cones and that mediates clear detailed vision | Synonyms: macula lutea, macular area, yellow spot |
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| (noun) a patch of skin that is discolored but not usually elevated; caused by various diseases | Synonyms: macule |
| (noun) a cooler darker spot appearing periodically on the sun's photosphere; associated with a strong magnetic field | Synonyms: sunspot |
| pinguecula | (noun) a slightly elevated elastic tissue deposit in the conjunctiva that may extend to the cornea but does not cover it | - |
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| trabecula | (noun) rod-shaped structures of fibrous tissue that divide an organ into parts (as in the penis) or stabilize the structure of an organ (as in the spleen) | - |
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| vallecula | (noun) (anatomy) any furrow or channel on a bodily structure or part | Synonyms: groove |
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