Wordnet 3.0
ADJECTIVE (1)
1.
of or relating to alga;
The Collaborative International Dictionary of English v.0.48:
Algal \Al"gal\, a., (Bot.)
Pertaining to, or like, alg[ae].
[1913 Webster]
WordNet (r) 3.0 (2006):
algal
adj 1: of or relating to alga