| 单词 | selenium |
| 释义 | selenium /si lee"nee euhm/, n. Chem. a nonmetallic element chemically resembling sulfur and tellurium, occurring in several allotropic forms, as crystalline and amorphous, and having an electrical resistance that varies under the influence of light. Symbol: Se; at. wt.: 78.96; at. no.: 34; sp. gr.: (gray) 4.80 at 25°C, (red) 4.50 at 25°C. [ < NL (1818) < Gk selén(e) moon + NL -ium -IUM; named in allusion to its similarity to TELLURIUM] |
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