D defs.my
Entry 2 senses Webster, 1913

Seaweed

/sēw'-ēdˌ/ · Sea·weed · IPA /ˈsiwid/
01 n. Popularly, any plant or plants growing in the sea.
  1. 1.
    Popularly, any plant or plants growing in the sea.
  2. 2.
    Any marine plant of the class Algae, as kelp, dulse, Fucus, Ulva, etc.(Bot.)