FLEHMEN
Etymology
Verb
flehmen (third-person singular simple present flehmens, present participle flehmening, simple past and past participle flehmened)
Alternative form of flehm
Noun
flehmen (countable and uncountable, plural flehmens)
(especially, in the compound "flehmen response") Flaring of the lip in mammals, associated with intensive smelling; flehming.
Etymology
Capitalized apparently due to the mistaken belief that the word (used in compounds like flehmen response) was an eponym.
Noun
Flehmen (plural not attested)
Nonstandard form of flehmen.
Source: Wiktionary