| 释义 |
WordReference Random House Learner's Dictionary of American English © 2024man•ga•nese /ˈmæŋgəˌnis, -ˌniz/USA pronunciation n. [uncountable]- Chemistrya hard, easily broken, grayish white, metallic element used chiefly in strengthening steel.
WordReference Random House Unabridged Dictionary of American English © 2024man•ga•nese (mang′gə nēs′, -nēz′),USA pronunciation n. [Chem.]- Chemistrya hard, brittle, grayish-white, metallic element, an oxide of which, MnO2 (man′ganese diox′ide), is a valuable oxidizing agent: used chiefly as an alloying agent in steel to give it toughness. Symbol: Mn;
at. wt.: 54.938;
at. no.: 25;
sp. gr.: 7.2 at 20°C.
- Italian manganese, alteration of Medieval Latin magnesia magnesia
- French manganèse
- 1670–80
Collins Concise English Dictionary © HarperCollins Publishers:: manganese /ˈmæŋɡəˌniːz/ n - a brittle greyish-white metallic element that exists in four allotropic forms, occurring principally in pyrolusite and rhodonite: used in making steel and ferromagnetic alloys. Symbol: Mn; atomic no: 25; atomic wt: 54.93805; valency: 1, 2, 3, 4, 6, or 7; relative density: 7.21–7.44; melting pt: 1246±3°C; boiling pt: 2062°C
Etymology: 17th Century: via French from Italian manganese, probably altered form of Medieval Latin magnesia |