| 释义 |
WordReference Random House Learner's Dictionary of American English © 2024at•om /ˈætəm/USA pronunciation n. [countable]- Physics
- Physicsthe smallest part of an element that still has the chemical properties of the element.
- this part of an element as the source of nuclear energy.
- a very small quantity: There was not even an atom of truth in that remark.
See -tom-. WordReference Random House Unabridged Dictionary of American English © 2024at•om (at′əm),USA pronunciation n. - Physics
- the smallest component of an element having the chemical properties of the element, consisting of a nucleus containing combinations of neutrons and protons and one or more electrons bound to the nucleus by electrical attraction;
the number of protons determines the identity of the element. - an atom with one of the electrons replaced by some other particle:muonic atom; kaonic atom.
- Energythis component as the source of nuclear energy.
- a hypothetical particle of matter so minute as to admit of no division.
- anything extremely small;
a minute quantity.
- Greek átomos, noun, nominal use of átomos undivided, equivalent. to a- a-6 + tomós divided, verbid of témnein to cut
- Latin atomus
- Middle English attomos, athomus 1350–1400
- 4.See corresponding entry in Unabridged shred, speck, scintilla, iota, jot, whit.
Collins Concise English Dictionary © HarperCollins Publishers:: atom /ˈætəm/ n - the smallest quantity of an element that can take part in a chemical reaction
- this entity as a source of nuclear energy: the power of the atom
- any entity regarded as the indivisible building block of a theory
- the hypothetical indivisible particle of matter postulated by certain ancient philosophers as the fundamental constituent of matter
- a very small amount or quantity; minute fragment: to smash something to atoms, there is not an atom of truth in his allegations
Etymology: 16th Century: via Old French and Latin, from Greek atomos (n), from atomos (adj) that cannot be divided, from a-1 + temnein to cut |