AskDefine | Define instar

Dictionary Definition

instar n : an insect or other arthropod between molts

User Contributed Dictionary



Latin instar ‘form, likeness’.


IPA: /'ɪnstɑ:/


  1. Any stage in the development or lifecycle of arthropods, between molts.
    • 1955: 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. — Vladimir Nabokov, Lolita



es-verb-ar inst
  1. to urge


es-conj-ar inst

Extensive Definition

An instar is a developmental stage of arthropods, such as insects, between each moult (ecdysis), until sexual maturity is reached. Arthropods must shed the exoskeleton in order to grow or assume a new form. Differences between instars can often be seen in altered body proportions or changes in the number of body segments. Some arthropods can continue to molt after sexual maturity, but these subsequent molts are generally not called instars.
For most insect species the term "instar" is used to denote the developmental stage of the larval or nymphal forms of holometabolous (complete metamorphism) or hemimetabolous (incomplete metamorphism) insects, but the term can be used to describe any developmental stage including pupa or imago (the adult, which does not molt in insects). The number of instars an insect completes depends on the species and the environmental conditions. Cooler temperatures and lower humidity often slow the rate of development.
instar in Portuguese: Ínstar
instar in Slovak: Instar
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