foilboard noun 1verb 1forms 3 noun1 •A surfboard with a hydrofoil that extends below the board into the water, causing the board to leave the surface of the water at various speeds. verb1 •To surf using a foilboard.For decades, kitesurfers and, more recently, their foilboarding descendants have turned up at Crissy Field, a scruffy crescent of sand at the foot of the historic Presidio of San Francisco. — 2020 formsfoilboarded · foilboarding · foilboards