instar

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in·star

(in'stahr),
Any of the successive nymphal stages in the metamorphosis of hemimetabolous insects (simple or incomplete metamorphosis), or the stages of larval change by successive molts that characterize the holometabolous insects (complex or complete metamorphosis).
[L. form]
Farlex Partner Medical Dictionary © Farlex 2012

instar

(ĭn′stär′)
n.
A stage of an insect or other arthropod between one molt and the next.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

in·star

(in'stahr)
Any of the successive nymphal or larval stages in the metamorphosis of insects.
[L. form]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

instar

a larval stage of insect development. The first instar hatches from the egg and after the first moult (see ECDYSIS becomes the second instar. Thus a third instar larva is one which has completed two moults.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005