Oily
来自Big Physics
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wiktionary
From Middle English oylei, equivalent to oil + -y. Compare German ölig(“oily”), Swedish oljig(“oily”).
etymonline
oily (adj.)
"resembling oil, having the qualities of oil," late 14c., oilei, from oil (n.) + -y (2). Figurative meaning "smooth, unctuous" is from 1590s. Related: Oilily; oiliness.
