Definition of instar in English:


Line breaks: in¦star
Pronunciation: /ˈɪnstɑː


A phase between two periods of moulting in the development of an insect larva or other invertebrate animal.
More example sentences
  • When the eggs hatch, the caterpillar enters the first instar (stage of development).
  • After the second moult, larvae preyed only on the first-instar nymphs of Libyaspis, while the larvae of later instars preyed on nymphs of a wide range of sizes.
  • The larval stage consists of four phases, or instars, with a complete molt between each instar.


late 19th century: from Latin, literally 'form, likeness'.

Definition of instar in:

Get more from Oxford Dictionaries

Subscribe to remove adverts and access premium resources

Word of the day noisome
Pronunciation: ˈnɔɪs(ə)m
having an extremely offensive smell