Having the shape or form of a star, especially like the star corals of the Astraea genus.
From Astraea (genus name) plus Latin -formis (having the form of), creating an adjective meaning 'star-shaped' or 'having the characteristic form of Astraea corals'.
This scientific adjective shows how naturalists create technical vocabulary by describing what things look like—'astraeiform' simply means 'looks like those star-corals the Greeks named after the justice goddess!'
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