atom
Concise Oxford English Dictionary © 2008 Oxford University Press:
atom/ˈatəm/
▶noun
- 1 the smallest particle of a chemical element, consisting of a positively charged nucleus (containing protons and typically also neutrons) surrounded by negatively charged electrons.
- 2 [usu. with neg.] an extremely small amount.
– origin C15: from OFr. atome, via L. from Gk atomos ‘indivisible’, based on a- ‘not’ + temnein ‘to cut’.
'atom' also found in these Oxford entries:
A-bomb
- alkyl
- aryl
- atom bomb
- atomic
- atomic mass
- atomic mass unit
- atomic number
- atomic volume
- bikini
- carbanion
- carbonium ion
- chelate
- complex
- coordinate
- cumulate
- cyanohydrin
- dehydrogenate
- deuteron
- donor
- electron pair
- epoxide
- ether
- event
- fissile
- fission bomb
- free
- geminal
- ground state
- hydrogen bond
- ion
- ionize
- ligand
- monad
- monatomic
- mono-
- monobasic
- monoxide
- nor-
- nucleosynthesis
- nucleus
- nuclide
- octet
- orbital
- organometallic
- oxidase
- oxidation number
- photoelectron
- primary
