Webster's English Dictionary

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alga

al.ga \'al-g*\ \'al-(.)je-\ \-g*l\ \-go.id\ n or al.gae also algas [L, 
   seaweed] pl  : any of a group (Algae) of chiefly aquatic nonvascular plants 
   (as seaweed s, pond scums, stoneworts) with chlorophyll often masked by a 
   brown or red pigment - al.gal aj