Buoy"ant (?), a. [From Buoy, v. t. & i.]
Having the quality of rising or floating in a fluid; tending to rise or float; as, iron is buoyant in mercury.
on the flood."
Bearing up, as a fluid; sustaining another body by being specifically heavier.
The water under me was buoyant.
Light-hearted; vivacious; cheerful; as, a buoyant disposition; buoyant spirits.
© Webster 1913.