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Definition of: pyrenoid
(pī·rē′noid) adjective
Having the form of a fruit stone.
—noun
1. Bot. A small, colorless mass of protein substance of a crystalline form, appearing in the chloroplasts of green algae.
2. Zool. A transparent body in the chromatophores of certain protozoa. [<Gk. pyrēnoeidēs <pyrēn a fruit stone + eidos a form, shape]
—py·re·no·de·an (pī′ri·nō′dē·ən) adjective
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