must, musth a. 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.
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musth
n : an annual phase of heightened sexual excitement in the males
of certain large mammals (especially elephants); is
associated with discharge from a gland between the eye
and ear; "the frenzied elephant was in musth"