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
And you think of how helpless they are as eggs and pupae, when they are stuck
  in place, unable to take evasive action.
His group has previously created cyborg beetles, including ones that have been
  implanted with electronic components as pupae.
Even the silk that the pupae use to spin their cocoons can be chemically
  processed to become edible.
The caterpillars of many kinds of moths, however, spin silken cocoons around
  them and change into pupae before winter comes.
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