5 letters · 10 points in Scrabble
originA variant of atomi, the plural of atomus (“hypothetical particle posited as an ultimate and indivisible component of matter; mote of dust in a sunbeam”) treated as a singular form. Atomus is derived from Latin atomus, from Ancient Greek ἄτομος (átomos, “indivisible”, adjective), from ᾰ̓- (ă-, prefix forming terms having an opposite sense) + τομ- (tom-) (stem of τέμνω (témnō, “to cut”), ultimately…
Etymology from Wiktionary, CC BY-SA 3.0