Having the shape or form of an arch or vault; resembling the curved structure of a fornix.
From Latin fornix (arch) combined with -form (from forma, meaning shape or form). This technical term primarily appears in anatomical descriptions where structures resemble arches.
This technical adjective is almost never used in modern English, but it's a perfect example of how scientists create new words by combining old Latin roots—anyone who knows Latin could instantly understand 'arch-shaped' even if they'd never heard the word before.
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