Definition of Bladderwrack

Noun: bladderwrack  'bla-du,rak

1. Similar to and found with black rockweed
   - Ascophyllum nodosum
    
2. A common rockweed used in preparing kelp and as manure
   - black rockweed, bladder fucus, tang, Fucus vesiculosus

See also:
bladderworts
bladdery