• Webster's Revised Unabridged Dictionary
    • n Pyrenoid (Zoöl) A transparent body found in the chromatophores of certain Infusoria.
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Century Dictionary and Cyclopedia
    • pyrenoid Resembling in form the stone of a fruit; globular; nucleiform; of excrescent bodies, wart-like.
    • n pyrenoid A small colorless mass of proteid substance of a crystalline form, usually appearing hexagonal in optical section.
    • n pyrenoid One of the colorless plastids, or leucoplasts, found in the chromatophores of algæ and constituting centers for the formation of starch.
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Chambers's Twentieth Century Dictionary
    • adjs Pyrenoid globular, nucleiform
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Webster's Revised Unabridged Dictionary
Gr. like a kernel. See Pyrena, and -oid
Chambers's Twentieth Century Dictionary
Gr. pyrēn.


In literature:

Several large pyrenoids are always found, often forming a regular line through the central axis.
"Elements of Structural and Systematic Botany" by Douglas Houghton Campbell
The chromatophores contain a variable number of pyrenoids, colourless proteid bodies of a crystalloidal character.
"Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 4" by Various