instar

kehitysvaihe Any one of the several stages of postembryonic development which an arthropod undergoes, between molts, before it reaches sexual maturity.
An arthropod at a specified one of these stages of development.
2005, Nematodes as biocontrol agents (edited by Parwinder S. Grewal, Ralf-Udo Ehlers, David I. Shapiro-Ilan), page 133:

In A. orientalis, first and second instars were more susceptible than third instars to H. bacteriophora TF strain, (..)

We avoided Tourist Homes, country cousins of Funeral ones, old-fashioned, genteel and showerless, with elaborate dressing tables in depressingly white-and-pink little bedrooms, and photographs of the landlady’s children in all their instars.

Yet mark with shining steps the humbler way;

And, as angelic feet instar the sky,

Drop the bright sparks along the wilderness.

Espey could distinguish through the clear darkness the fringed branches of a pine-tree clinging to the heights above and waving against the instarred sky, and below a vague moving whiteness (..)

He was dreaming, surely; or were those deep, instarred eyes really fixed upon him with that wistful gaze which he had seen only twice before?