5 letters · 17 points in Scrabble
noun (botany) the whorl of sepals of a flower collectively forming the outer floral envelope or layer of the perianth enclosing and supporting the developing bud; usually green
originFrom Latin calyx, from Ancient Greek κάλυξ (kálux, “case of a bud, husk”). Doublet of chalice and kelch.
Etymology from Wiktionary, CC BY-SA 3.0