14 letters · 21 points in Scrabble
adjective involving or depending on several factors or causes (especially pertaining to a condition or disease resulting from the interaction of many genes)
originEtymology tree Proto-Indo-European *mel-der. Proto-Indo-European *ml̥tós? Proto-Italic *moltos Latin multus Latin multīder. Middle English multi- English multi- English factor Proto-Indo-European *h₂el-der.? Proto-Italic *-ālis Latin -ālisder. Old French -ialder. Middle English -ial English -ial English factorial English multifactorial From multi- + factorial.
Etymology from Wiktionary, CC BY-SA 3.0