labellum
la.bel.lum \l*-'bel-*m\ \-'bel-*\ n or la.bel.la [NL, fr. L, dim. of labrum lip] pl 1: the median member of the corolla of an orchid 2: a terminal part of the labium or labrum of various insects
Webster's English Dictionaryla.bel.lum \l*-'bel-*m\ \-'bel-*\ n or la.bel.la [NL, fr. L, dim. of labrum lip] pl 1: the median member of the corolla of an orchid 2: a terminal part of the labium or labrum of various insects