grana

grana

[grey-nuh]
noun
(in prescriptions) plural of granum.

Origin:
1890–95; < Latin

Dictionary.com Unabridged

granum

[grey-nuhm]
noun, plural grana [grey-nuh] .
1.
(in prescriptions) a grain.
2.
Botany. one of the structural units of a chloroplast in vascular plants, consisting of layers of thylakoids.

Origin:
< Latin

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Science Dictionary
granum   (grā'nəm)  Pronunciation Key 
Plural grana (grā'nə)
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. See more at chloroplast.
The American Heritage® Science Dictionary
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