Definify.com

Webster 1913 Edition

Adj.

Of or pertaining to billows; swelling or swollen into large waves; full of billows or surges; resembling billows.

And whitening down the many-tinctured stream,
Descends the

billowy

foam.

Thomson.

Adj.

Swelling, or swelled into large waves; wavy; full of billows, or surges.