IPA: //prɪˈpjuːpə//
KK: /prɛˈpjuːpə/
A stage in the life cycle of some insects that occurs just before they become a pupa, during which they are inactive and do not feed.
The caterpillar transformed into a prepupa before finally becoming a pupa.
Prepupa is formed from "pre-" (meaning before) and "pupa" (from Latin, meaning doll or puppet, and in biological terms refers to the life stage of an insect between larva and adult). The word "prepupa" refers to the stage of an insect that occurs before it reaches the pupal stage.
Think of 'pre-' meaning before and 'pupa' referring to the insect stage — so a prepupa is the stage that comes before the pupa.