• synonyms


[pahy-ree-noid, pahy-ruh-noid]
  1. a spherical protein structure found within chloroplasts of certain algae and hornworts.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for pyrenoid

Historical Examples of pyrenoid

  • A pyrenoid lies in a fold of the chromatophore on the dorsal part.

    The Diatomaceae of Philadelphia and Vicinity

    Charles Sumner Boyer

  • The pyrenoid is evidently concerned in the formation of the chromatophore, or in its division.

  • Schmitz states that the chromatophore is thickened in the middle and contains a pyrenoid.

British Dictionary definitions for pyrenoid


  1. any of various small protein granules that occur in certain algae, mosses, and protozoans and are involved in the synthesis of starch
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Word Origin for pyrenoid

C19: from pyrene ² + -oid
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012