Definition

1. Noun:
   • A stage in the life cycle of an insect or other arthropod between molts: An "instar" refers to the form an arthropod takes during a specific developmental period, from one molt to the next. Each instar is typically larger and more developed than the previous one.

Examples of Usage

• Noun:
  • The caterpillar entered its fifth instar before forming a chrysalis.
  • Scientists studied the feeding habits of the larval instars.

Advanced Usage

• "First instar" / "Final instar": These terms specify the earliest or last developmental stage before a major transformation (e.g., pupation).
  • The first instar nymph is barely visible to the naked eye.
  • The final instar larva stops eating and prepares to pupate.

Variants and Related Words

• Instar is used exclusively as a noun in its entomological sense. The verb form meaning "to adorn with stars" is archaic and not related to the primary biological definition.

Synonyms

• Developmental stage: A general term for a phase in an organism's growth.
• Larval stage / Nymphal stage: More specific terms for instars in particular types of arthropods.

Related Phrases

• To molt between instars: The process of shedding the exoskeleton to progress to the next growth stage.
  • The insect must molt between instars to grow.

Noun

1. an insect or other arthropod between molts