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instar
This term is a specialized biological descriptor used almost exclusively in entomology and zoology to describe the discrete growth phases of arthropods. It conveys a sense of punctuated equilibrium, where a creature remains a constant size until a sudden shedding of the exoskeleton allows for a rapid increase in volume.
Because it refers to a specific biological stage, it is used in technical reports and academic papers rather than casual conversation. It is distinct from the general term larva, as an instar refers to the specific interval between molts rather than the entire larval period.
Meanings
Examples
The caterpillar is currently in its third instar.
How many instars does this species of beetle have before it pupates?
Each instar is characterized by a specific size and set of features.
The first instar larvae are almost microscopic and very fragile.
I wonder if this spider is in its second or third instar.
The insect must molt to progress to the next instar.
Look at the difference in size between the second and fourth instar nymphs.
The parasite enters the host during the second instar stage.