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buoyant

[boi-uh nt, boo-yuh nt] /ˈbɔɪ ənt, ˈbu yənt/
adjective
1.
tending to float in a fluid.
2.
capable of keeping a body afloat, as a liquid.
3.
not easily depressed; cheerful.
4.
cheering or invigorating.
Origin
1570-1580
1570-80; buoy + -ant
Related forms
buoyantly, adverb
nonbuoyant, adjective
nonbuoyantly, adverb
unbuoyant, adjective
unbuoyantly, adverb
Synonyms
3. happy, lighthearted, breezy, jaunty, sunny.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for nonbuoyant

buoyant

/ˈbɔɪənt/
adjective
1.
able to float in or rise to the surface of a liquid
2.
(of a liquid or gas) able to keep a body afloat or cause it to rise
3.
cheerful or resilient
Word Origin
C16: probably from Spanish boyante, from boyar to float, from boya buoy, ultimately of Germanic origin
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for nonbuoyant

buoyant

adj.

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.

Online Etymology Dictionary, © 2010 Douglas Harper
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