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granum

[ grey-nuhm ]

noun

, plural gra·na [grey, -n, uh].
  1. (in prescriptions) a grain.
  2. Botany. one of the structural units of a chloroplast in vascular plants, consisting of layers of thylakoids.


granum

/ grānəm /

, Plural grana grā

  1. A stacked membranous structure within the chloroplasts of plants and green algae that contains the chlorophyll and is the site of the light reactions of photosynthesis. The saclike membranes that make up grana are known as thylakoids.
  2. See more at chloroplast


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Word History and Origins

Origin of granum1

From Latin
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Example Sentences

Imperial Granum is an example of this group, and there are several others with similar compositions.

The Spanish name grana, confounded with granum, may have given rise to this contest.

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granuloseGranville