| 释义 |
WordReference Random House Learner's Dictionary of American English © 2024ox•y•gen /ˈɑksɪdʒən/USA pronunciation n. [uncountable]- Chemistrya colorless, odorless gas, an element that is about one-fifth of the volume of the atmosphere and is present in a combined state in nature.
WordReference Random House Unabridged Dictionary of American English © 2024ox•y•gen (ok′si jən),USA pronunciation n. [Chem.]- Chemistrya colorless, odorless, gaseous element constituting about one-fifth of the volume of the atmosphere and present in a combined state in nature. It is the supporter of combustion in air and was the standard of atomic, combining, and molecular weights until 1961, when carbon 12 became the new standard. Symbol: O; at. wt.: 15.9994;
at. no.: 8;
density: 1.4290 g/l at 0°C and 760 mm pressure.
- French oxygène, equivalent. to oxy- oxy-1 + -gène -gen
- 1780–90
Collins Concise English Dictionary © HarperCollins Publishers:: oxygen /ˈɒksɪdʒən/ n - a colourless odourless highly reactive gaseous element: the most abundant element in the earth's crust (49.2 per cent). It is essential for aerobic respiration and almost all combustion and is widely used in industry. Symbol: O; atomic no: 8; atomic wt: 15.9994; valency: 2; density: 1.429 kg/m³; melting pt: –218.79°C; boiling pt: –182.97°C
- (as modifier): an oxygen mask
oxygenic /ˌɒksɪˈdʒɛnɪk/, oxygenous /ɒkˈsɪdʒɪnəs/ adj oxy-,1 - a combining form meaning "sharp,'' "acute,'' "keen,'' "pointed,'' "acid,'' used in the formation of compound words:oxycephalic;oxygen;oxymoron.
- Greek, combining form of oxýs sharp, keen, acid
- Chemistrya combining form representing oxygen in compound words, sometimes as an equivalent of hydroxy-: oxychloride.
|