dormantyoudaoicibaDictYouDict[dormant 词源字典]
dormant: [14] Like dormitory and dormer, dormant comes ultimately from Latin dormīre ‘sleep’, which is related to Sanskrit drā- ‘sleep’ and Russian dremat’ ‘doze’. Dormant was borrowed from French dormant, the present participle of dormir ‘sleep’, while dormitory [15] comes from Latin dormītōrium, a derivative of the past participle of dormīre. Dormer [16], from Old French dormeor, a derivative of dormir, originally signified a ‘dormitory window’. (It is not clear whether dormouse [15] is related, but if it is it would mean literally ‘sleeping mouse’, or conceivably even ‘sleeper’, from French dormeuse, the feminine of dormeur ‘sleeper’.)
=> dormer, dormitory[dormant etymology, dormant origin, 英语词源]
dormant (adj.)youdaoicibaDictYouDict
late 14c., "fixed in place," from Old French dormant (12c.), present participle of dormir "to sleep," from Latin dormire "to sleep," from PIE root *drem- "to sleep" (cognates: Old Church Slavonic dremati "to sleep, doze," Greek edrathon "I slept," Sanskrit drati "sleeps"). Meaning "in a resting situation" (in heraldry) is from c. 1500. Meaning "sleeping' is from 1620s.