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tay (n.)
[tay 词源字典]
mid-15c., "case, sheath," from French
teie
(Old French
toie
"pillowcase, cushion-cover), from Latin
theca
, from Greek
theke
"case to put something in" (see
theco-
). As "outer membrane of the brain" from 1560s.
[tay etymology, tay origin, 英语词源]