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atom

at·om

atom

pronunciation:
ae tm
features:
Word History, Word Explorer, Word Parts
part of speech: noun
definition 1: an invisible component of any element, consisting of protons, neutrons, and electrons, once considered the smallest possible unit of matter.
definition 2: anything extremely small; tiny bit.
similar words:
grain, modicum, molecule, particle
Word History
Atom is from an ancient Greek word that means "not able to be cut or divided."
Word Explorer
See
  chemistry, physics
Word Parts
The word atom contains the following parts:
a-1, an-1 Greek prefix that means not, without
Show wordsHide wordsMore about this word part:
Words prefixed with a-1, an-1 are nouns and adjectives. Some are loanwords from Greek (amorphous , atrophy ). Others are English formations, which may attach the prefix to English words of Latin origin (asocial , amoral ) or Greek origin (apolitical). The form a-1 is used before bases beginning with a consonant, while an-1 is used before bases beginning with a vowel.