What is the meaning of lepidopteran?

: any of a large order (Lepidoptera) of insects comprising the butterflies, moths, and skippers that as adults have four broad or lanceolate wings usually covered with minute overlapping and often brightly colored scales and that as larvae are caterpillars.

What does this word mean proboscis?

1a : the trunk of an elephant also : any long flexible snout. b : the human nose especially when prominent. 2 : any of various elongated or extensible tubular processes (such as the sucking organ of a butterfly) of the oral region of an invertebrate.