UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈbɔɪənt/US:USA pronunciation: IPA and respellingUSA pronuncation: IPA/ˈbɔɪənt, ˈbuyənt/ ,USA pronunciation: respelling(boiənt, bo̅o̅yənt)

WordReference Random House Learner's Dictionary of American English © 2020
buoy•ant /ˈbɔɪənt, ˈbuyənt/USA pronunciation   adj. 
  1. of or relating to buoyancy.
buoy•ant•ly, adv. 

WordReference Random House Unabridged Dictionary of American English © 2020
buoy•ant  (boiənt, bo̅o̅yənt),USA pronunciation adj. 
  1. tending to float in a fluid.
  2. capable of keeping a body afloat, as a liquid.
  3. not easily depressed;
  4. cheering or invigorating.
buoyant•ly, adv. 
  • buoy + -ant 1570–80
    • 3.See corresponding entry in Unabridged . happy, lighthearted, breezy, jaunty, sunny.

Collins Concise English Dictionary © HarperCollins Publishers::
buoyant /ˈbɔɪənt/ adj
  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
Etymology: 16th Century: probably from Spanish boyante, from boyar to float, from boya buoy, ultimately of Germanic origin
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