
1) Algae 2) Aluminium alloy 3) Anabaena 4) Anabaena or chlorella 5) Anabaena or nostoc 6) Antifouling target on a keel 7) Aquarium annoyance 8) Aquarium dweller 9) Aquarium growth 10) Aquarium life 11) Aquarium organism 12) Aquatic organism 13) Aquatic organisms 14) Aquatic plant 15) Birdbath bit 16) Birdbath cover
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1) Algae 2) Chlorella 3) Chlorophyte 4) Cryptomonad 5) Cryptophyte 6) Diatom 7) Euglenid 8) Euglenoid 9) Euglenophyte 10) Sea weed
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https://www.crosswordclues.com/clue/alga

• (n.) A kind of seaweed; pl. the class of cellular cryptogamic plants which includes the black, red, and green seaweeds, as kelp, dulse, sea lettuce, also marine and fresh water confervae, etc.
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http://thinkexist.com/dictionary/meaning/alga/

Aquatic plants or plants of damp habitats having unicellular and multi-cellular forms that are distinguished from the fungi by the presence of chlorophyll.
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http://www.encyclo.co.uk/visitor-contributions.php
Al'ga noun ;
plural Algæ [ Latin , seaweed.]
(Botany) A kind of seaweed;
plural the class of cellular cryptogamic plants which includes the black, red, and green seaweeds, as kelp, dulse, sea lettuce, also marine and fresh water confervæ, etc.
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http://www.encyclo.co.uk/webster/A/54

[
n] - primitive chlorophyll-containing mainly aquatic eukaryotic organisms lacking true stems and roots and leaves
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http://www.webdictionary.co.uk/definition.php?query=alga

alga (s), algae (pl) Photosynthetic organisms lacking a vascular system, true leaves, stems, and roots. Algae range in size from the microscopic to the macroscopic, and include many seaweeds found in fresh water and marine habitats.
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algae noun primitive chlorophyll-containing mainly aquatic eukaryotic organisms lacking true stems and roots and leaves
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https://www.encyclo.co.uk/local/20974
No exact match found.