| monotone | (noun) an unchanging intonation | Synonyms: drone, droning |
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| (noun) a single tone repeated with different words or different rhythms (especially in rendering liturgical texts) | - |
| monotony | (noun) the quality of wearisome constancy, routine, and lack of variety | Synonyms: humdrum, sameness |
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| (noun) constancy of tone or pitch or inflection | - |
| monotopism | (noun) origin of a systematic group only once (as by mutation) or at a single location. | - |
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| notochord | (noun) a flexible rodlike structure that forms the supporting axis of the body in the lowest chordates and lowest vertebrates and in embryos of higher vertebrates | - |
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| notoriety | (noun) the state of being known for some unfavorable act or quality | Synonyms: ill fame |
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| notornis | (noun) flightless New Zealand birds similar to gallinules | Synonyms: Notornis mantelli, takahe |
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| rhinotomy | (noun) surgical procedure in which an incision is made in the nose to drain accumulated pus | - |
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