tap / space
Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
From New Latin, from acanthus (“thorn”), (from Ancient Greek ἄκανθος (ákanthos)) + Ancient Greek πτερύγιον (pterúgion) diminutive of πτέρυξ (ptérux, “wing, fin”), from πτερόν (pterón, “feather, wing”).
spiny-finned fish
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Classic usage
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