WRACK, WRECK, n. [See Wreck.] A name given to a marine plant which is of great utility as a manure. It is called sometimes sea-wrack or sea-wreck, and sea-oak and sea-tangle. It is the Fucus vesiculosus of Linne, a plant found on rocks left dry at low water. The stalk runs along the middle of the leaf, and is terminated by watery bladders. The grass wrack is of the genus Zostera. Wrack, and to wrack. [See Wreck.]