10 letters · 17 points in Scrabble
noun an organic compound usually formed as an intermediate product in the preparation of acetals from aldehydes or ketones
originEtymology tree Proto-Indo-European *sem- Proto-Indo-European *sēmi Ancient Greek ἡμῐ- (hēmĭ-)lbor. English hemi- English acetal English hemiacetal From hemi- + acetal.
Etymology from Wiktionary, CC BY-SA 3.0