zoochlorella

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zo·o·chlor·el·la

 (zō′ə-klə-rĕl′ə)
n. pl. zo·o·chlor·el·lae (-klə-rĕl′ē)
Any of various one-celled green algae that live symbiotically within the cells of aquatic invertebrate organisms such as sponges and sea anemones or within certain protists.