atom noun
Category: theory: molar-molecular.
1604, Cawdrey:
Not listed.
1626, Cockeram: (atomy)
a mote flying in the sunne-beames: any thing so small that it cannot be made lesse.
1658, Phillips:
a mote in the sun-beams, also a word used in Philosophy, being the smallest part of a body that can be imagined.
1676, Coles: (atome)
G. a mote in the sun; the smallest part of any thing.