8 letters · 22 points in Scrabble
adjective convex on both sides; shaped like a lentil
originEtymology tree Proto-Indo-European *dwóh₁ Proto-Indo-European *dwi- Proto-Italic *dwi- Latin bi-bor. English bi- English convex English biconvex From bi- + convex.
Etymology from Wiktionary, CC BY-SA 3.0