pupa -
An insect in its development stage between a larva and an adult.
Wikipedia
A pupa is the life stage of some insects undergoing transformation. The pupal stage is found only in holometabolous insects, those that undergo a complete metamorphosis, going through four life stages; embryo, larva, pupa and imago. (For a list of such insects see Holometabolism).
OmegaWiki Dictionary
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pupa The form taken by some insects at an early stage in their development.
pupa A life stage of some insects undergoing transformation.