Webster's Revised Unabridged Dictionary · 1913

Wrack

Wrack , noun

A thin, flying cloud; a rack.

Wrack , transitive verb

To rack; to torment. [Rare]

Wrack , noun

[Old English wrak wreck. See Wreck.]

1.
Wreck; ruin; destruction. [Obsolete] — Milton
A world devote to universal wrack. — Chaucer
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.
(Botany) Coarse seaweed of any kind.
Collocations (1)
Wrack grass or Grass wrack (Botany) , eelgrass.

Wrack , transitive verb

To wreck. [Obsolete] — Dryden