/ ˈældʒiː; NAmE ; ˈælgiː/ noun
[ U , pl. ] ( sing. alga / ˈælgə; NAmE /) ( technical ) very simple plants with no real leaves, stems or roots that grow in or near water, including seaweed
► algal / ˈælgəl; NAmE / adjective [ only before noun ]:
algal blooms / growth
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WORD ORIGIN
mid 16th cent.: from Latin , seaweed .