a state or condition of violent, destructive frenzy occurring with the rutting season in male elephants, accompanied by the exudation of an oily substance from glands between the eyes and mouth.
Also, must.

1870–75; < Urdu mast < Persian: literally, drunk Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
musth or must (mʌst)
(often preceded by in) a state of frenzied sexual excitement in the males of certain large mammals, esp elephants, associated with discharge from a gland between the ear and eye
[C19: from Urdu mast, from Persian: drunk]
must or must
[C19: from Urdu mast, from Persian: drunk]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
musth also must   (mŭst)  Pronunciation Key 
An annual period of heightened aggressiveness and sexual activity in male elephants.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Elephant temporal gland ultrastructure and androgen secretion during musth.
Carriers musth ave the current and new license available to law enforcement until the effective date of the new license.
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