Definition of microlepidopterous in English:

microlepidopterous

Pronunciation /ˌmʌɪkrə(ʊ)lɛpɪˈdɒpt(ə)rəs/

adjective

Entomology

Origin

Mid 19th century; earliest use found in Reports of the British Association for the Advancement of Science. From microlepidoptera + -ous.