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buoyant (adj.)
[buoyant 词源字典]
1570s, perhaps from Spanish
boyante
, present participle of
boyar
"to float," from
boya
"buoy," from Dutch
boei
(see
buoy
(n.)). Of personalities, etc., from c. 1748. Related:
Buoyantly
.
[buoyant etymology, buoyant origin, 英语词源]