"Frena" is a word in ENGLISH

The green sea swept into the shallows and seethed there like slaking quicklime. It surged over the rocks, tossing up spangles of water like a juggler and catching them deftly again behind. It raced knee-deep through the clefts and crevices, twisted and tortured in a thousand ways, till it swept nuzzling and sucking into the holes at the base of the cliff. The whole reef was a shambles of foam, but it was bright in the sun, bright as a shattered mirror, exuberant and leaping with light.