noun, plural pupae [pyoo-pee] , pupas.
an insect in the nonfeeding, usually immobile, transformation stage between the larva and the imago.

1765–70; < Neo-Latin, special use of Latin pūpa girl, doll, puppet. See pupil1, puppet

pupal, adjective
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World English Dictionary
pupa (ˈpjuːpə)
n , pl -pae, -pas
coarctate exarate See obtect an insect at the immobile nonfeeding stage of development between larva and adult, when many internal changes occur
[C19: via New Latin, from Latin: a doll, puppet]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1773, "post-larval stage of an insect," special use by Linnæus (1758) of L. pupa "girl, doll, puppet" (see pupil (1)) on notion of "undeveloped creature."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
pupa  [%PREMIUM_LINK%]     (py'pə)  Pronunciation Key 

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Plural pupae (py'pē)
An insect in the nonfeeding stage of development between the larva and adult, during which it typically undergoes a complete transformation within a protective cocoon or hardened case. Only certain kinds of insects, such as moths, butterflies, ants, and beetles, develop as larvae and pupae. Compare imago, larva, nymph.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The mature larva forms a pupa and transforms into the adult insect which is a
  gray to brown colored moth with a one inch wingspan.
When they reach full size, they attach to a leaf by their tail, and a pupa is
Once out of the pupa, the damp butterfly inflates its wings with blood stored
  in its abdomen.
Empty fly pupa were found with the kids' remains, indicating that maggots ate
  their flesh during natural decomposition.
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