| anestrum | (noun) applies to nonhuman mammals: a state or interval of sexual inactivity between two periods of estrus | Synonyms: anestrus, anoestrum, anoestrus |
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| anoestrum | (noun) applies to nonhuman mammals: a state or interval of sexual inactivity between two periods of estrus | Synonyms: anestrum, anestrus, anoestrus |
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| antrum | (noun) a natural cavity or hollow in a bone | - |
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| centrum | (noun) the main body of a vertebra | - |
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| chetrum | (noun) 100 chetrums equal 1 ngultrum in Bhutan | - |
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| claustrum | (noun) a layer of grey matter in the brain adjacent to the lenticular nucleus | - |
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| colostrum | (noun) milky fluid secreted for the first day or two after parturition | Synonyms: foremilk |
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| diestrum | (noun) (of animals having several estrous cycles in one breeding season) a state or interval of sexual inactivity or quiescence between periods of activity | Synonyms: diestrus |
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| electrum | (noun) an alloy of gold and silver | - |
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| hippeastrum | (noun) amaryllis of tropical America often cultivated as a houseplant for its showy white to red flowers | Synonyms: Hippeastrum puniceum |
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| lustrum | (noun) a ceremonial purification of the Roman population every five years following the census | - |
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| (noun) a period lasting five years | - |
| ngultrum | (noun) the basic unit of money in Bhutan | - |
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| nostrum | (noun) patent medicine whose efficacy is questionable | - |
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| (noun) hypothetical remedy for all ills or diseases; once sought by the alchemists | Synonyms: catholicon, cure-all, panacea |
| plectrum | (noun) a small thin device (of metal or plastic or ivory) used to pluck a stringed instrument | Synonyms: pick, plectron |
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| rostrum | (noun) beaklike projection of the anterior part of the head of certain insects such as e.g. weevils | Synonyms: snout |
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| (noun) a platform raised above the surrounding level to give prominence to the person on it | Synonyms: ambo, dais, podium, pulpit, soapbox, stump |
| spectrum | (noun) a broad range of related objects or values or qualities or ideas or activities | - |
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| (noun) an ordered array of the components of an emission or wave | - |
| strum | (noun) sound of strumming | - |
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| (verb) sound the strings of (a stringed instrument) | Synonyms: thrum |
| tantrum | (noun) a display of bad temper | Synonyms: conniption, fit, scene |
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