Entry 6 senses · 4 variants Webster, 1913 Wrack /răk/ · IPA /ɹæk/ n. v. t. n. v. t. 01 n. A thin, flying cloud; a rack. 1. A thin, flying cloud; a rack. 02 v. t. To rack; to torment. 1. To rack; to torment.[R.] 03 n. Wreck; ruin; destruction. 1. Wreck; ruin; destruction.[Obs.] 2. Any marine vegetation cast up on the shore, especially plants of the genera Fucus, Laminaria, and Zostera, which are most abundant on northern shores. 3. Coarse seaweed of any kind.(Bot.) Phrases & compounds Wrack grass — eelgrass. 04 v. t. To wreck. 1. To wreck.[Obs.]