GNU Collaborative International Dictionary of English
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Found one definition
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must, musth (mŭst), a. [Hind. mast intoxicated, ruttish, fr. Skr. matta, p.p. of mad to rejoice, intoxicate.] (Zool.) Being in a condition of dangerous frenzy, usually connected with sexual excitement; -- said of adult male elephants which become so at irregular intervals, typicaly due to increased testosterone levels. -- n. (a) The condition of frenzy. (b) An elephant in must.
[Webster 1913 Suppl. +PJC]