Pyrenoid definitions

pī-rē'noid', pī'rə-
A proteinaceous structure found within the chloroplast of certain algae and hornwort bryophytes. It is thought to be a site where carbon is concentrated.
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A small structure within a chloroplast, as in some algae, functioning as a center for starch production.
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(biology) Any of several transparent structures found in the chloroplast of certain algae etc.; they are responsible for the fixation of carbon dioxide and the formation of starch.
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Origin of pyrenoid

New Latin pȳrēna fruit stone pyrene1 –oid