alga [s.], algae [pl.], alg- (Latin: seaweed).algicolous: 
Living on algae (seaweed).
 
algin: 
A mucilaginous substance, alginic acid, obtained from certain algae.
 
algoid: 
Resembling, or of the nature of seaweed.
 
algology: 
The study of seaweed; phycology.
 
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