
1) Alga 2) Algae 3) Dietary supplement 
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https://www.crosswordclues.com/clue/chlorella

1) Alga 
Found on 
https://www.crosswordclues.com/clue/chlorella

 Chlorella is a genus of single-cell green algae, belonging to the phylum Chlorophyta. It is spherical in shape, about 2 to 10 μm in diameter, and is without flagella. Chlorella contains the green photosynthetic pigments chlorophyll-a and -b in its chloroplast. Through photosynthesis, it multiplies rapidly, requiring only carbon dioxide, water, su...
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http://en.wikipedia.org/wiki/Chlorella

genus of green algae found either singly or clustered in fresh or salt water and in soil. The alga cell is spherical and has a cup-shaped ... [5 related articles]
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http://www.britannica.com/eb/a-z/c/75

Nonmotile unicellular green algae potentially valuable as a source of high-grade protein and b-complex vitamins. ... (12 Dec 1998) ... 
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http://www.encyclo.co.uk/local/20973

Genus of green unicellular algae extensively used in studies of photosynthesis.
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Chlorella is a genus of plants common in ponds, ditches and other stagnant water and also on the surface of wet soil. They often form a green powdery growth on tree trunks and damp walls, being comprised of millions of the plants.
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http://www.probertencyclopaedia.com/browse/BC.HTM

[
n] - any alga of the genus Chlorella
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http://www.webdictionary.co.uk/definition.php?query=chlorella
 noun any alga of the genus Chlorella
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https://www.encyclo.co.uk/local/20974

any freshwater, unicellular green alga of the genus Chlorella.
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https://www.infoplease.com/dictionary/chlorella
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