9 letters · 19 points in Scrabble
originThe adjective is derived from Latin clāvifōrmis (“club-shaped, claviform”), from Latin clāva (“a club”) (from Proto-Indo-European *kelh₂- (“to beat; to break”)) + -fōrmis (suffix meaning ‘having the form of’) (equivalent to -form, -iform). The English word is cognate with French claviforme. By surface analysis, clav(a) + -i- + form. The noun is probably derived from the adjective.
Etymology from Wiktionary, CC BY-SA 3.0