atom

The word 'atom' originates from the Greek 'atomos,' meaning "indivisible" or "uncuttable." This term was coined by ancient Greek philosophers, notably Democritus, who theorized that matter was composed of fundamental, indivisible particles. The literal components, 'a-' (not) and 'tomos' (cut), directly convey the concept of something that cannot be cut or divided further. While modern science has revealed that atoms are composed of subatomic particles, the term retains its core conceptual link to a fundamental, irreducible unit of matter.

Structure: a (not) + tom (cut) 'a-' is a Greek prefix meaning "not" or "without." 'tom' is from the Greek root 'tomos,' meaning "a cutting" or "a slice," derived from the verb 'temnein,' meaning "to cut."