## Etymology
A variant of custrel, from Old French coustillier 'knave, knight's attendant', from coustille 'a dagger', from Latin cultellus 'small knife'; influenced by association with the kestrel hawk.

## AI Etymology
Coistril is a noun meaning "a knave or base fellow; a groom or knight's attendant (archaic)". Historically, it is a variant of custrel, from Old French coustillier 'knave, knight's attendant', from coustille 'a dagger', from Latin cultellus 'small knife'; influenced by association with the kestrel hawk. The visible construction is part of the etymology: coistril is not just an unanalyzed simple word. The historical chain links Old French coustillier with Latin cultellus. Close English family members include kestrel, and custrel.

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coistril

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