molluscyoudaoicibaDictYouDict[mollusc 词源字典]
mollusc: [18] Etymologically, a mollusc is a ‘soft’ creature. The word comes ultimately from Latin molluscus ‘soft’, a derivative of mollis ‘soft’. In classical times it was used as a noun for various ‘soft’ things, such as a sort of thinshelled nut and a species of fungus that grew from maple trees, but its application to a range of invertebrate animals seems to have been introduced by the Swedish naturalist Linnaeus in the mid-18th century.

Latin mollis (source also of English mollify [15]) goes back ultimately to Indo-European *mel-, *mol-, *ml- ‘grind’, which also produced English meal ‘flour’, mill, and molar.
=> meal, melt, mild, mill, molar, mollify[mollusc etymology, mollusc origin, 英语词源]
mollusc (n.)youdaoicibaDictYouDict
see mollusk.