| 词汇 | ephemera |
| 词根词缀 | 词源： late 14c., originally a medical term, from M.L. ephemera (febris) "(fever) lasting a day," from fem. of ephemerus, from Gk. ephemeros "lasting only one day," from epi "on" + hemerai, dat. of hemera "day," from PIE *amer- "day." Sense extended to short-lived insects and flowers; general sense of "transitory" is first attested 1630s. Ephemeris "table of astronomical calculations" is from 1550s. |
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