filteryoudaoicibaDictYouDict[filter 词源字典]
filter: [14] Ultimately, filter is the same word as felt – and indeed that is what it first meant in English (‘They dwell all in tents made of black filter’, John Mandeville, Travels 1400). It comes via Old French filtre from medieval Latin filtrum, which was borrowed from prehistoric West Germanic *filtiz, source of English felt. The modern sense of filter did not develop until the 17th century; it came from the use of felt for removing impurities from liquid. The derivative infiltrate dates from the 18th century. (The homophonic philtre [16] is not related; it comes ultimately from Greek phílos ‘beloved’.)
=> felt, infiltrate[filter etymology, filter origin, 英语词源]
mucusyoudaoicibaDictYouDict
mucus: [17] Mucus was borrowed from Latin mūcus ‘nasal mucus’, which was related to two ancient verbs for ‘blow the nose’: Greek mússesthai and Latin ēmungere. The homophonic adjectival derivative mucous [17] (as in mucous membrane) comes from Latin mūcōsus. Related forms to have reached English are mucilage [14], from the late Latin derivative mūcilāgō, and moist.
=> moist, mucilage
quayyoudaoicibaDictYouDict
quay: [14] Quay is of Celtic origin. Its immediate source was Old French kai, but this was borrowed from Gaulish caio, which went back to an Old Celtic *kagio-. The spelling quay was introduced from modern French in the 17th century. The homophonic cay ‘small coral island’ [18] comes from cayo, a Spanish borrowing from French quai.
=> cay
homophone (n.)youdaoicibaDictYouDict
"a word pronounced the same as another (whether spelled the same or not) but different in meaning," 1843, from the adjective homophone (1620s), from Greek homos "same" (see homo- (1)) + phone "sound," from PIE root *bha- (2) "to speak, tell, say" (see fame (n.)). Related: Homophonic.