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usable (adj.)
[usable 词源字典]
late 14c., from Old French
usable
"available, in use" (14c.), from
user
(see
use
(v.)). Not a common word before c. 1840, when probably it was re-formed from
use
(v.) +
-able
. Related:
Usably
.
[usable etymology, usable origin, 英语词源]