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Wordnet 3.0

NOUN (1)

1. an insect or other arthropod between molts;


The Collaborative International Dictionary of English v.0.48:

Instar \In"star`\, n. a postembryonic stage of life of an arthropod, especially an insect, between two successive molts; also, the arthropod when in that stage of life. [PJC]
The Collaborative International Dictionary of English v.0.48:

Instar \In*star"\, v. t. To stud as with stars. [R.] "A golden throne instarred with gems." --J. Barlow. [1913 Webster]
WordNet (r) 3.0 (2006):

instar n 1: an insect or other arthropod between molts
Bouvier's Law Dictionary, Revised 6th Ed (1856):

INSTAR. Likeness; resemblance; equivalent as, instar dentium, like teeth; instar omnium, equivalent to all.