noun py·re·noid \pī-ˈrē-ˌnȯid, ˈpī-rə-\

Definition of pyrenoid

  1. :  a protein body in the chloroplasts of algae and hornworts that is involved in carbon fixation and starch formation and storage

Origin and Etymology of pyrenoid

International Scientific Vocabulary, from New Latin pyrena stone of a fruit, from Greek pyrēn; akin to Greek pyros wheat grain, wheat — more at furze

First Known Use: circa 1875

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