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

/ grā′nəm /

, Plural grana grā′nə

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

Word History and Origins

Origin of granum¹

From Latin

Example Sentences

They probably wouldn’t have bet on Clarice “Pinky” Granum, Stern’s pink-haired, Day-Glo-tattoed, nose-nail-wearing granddaughter.

From Los Angeles Times

Nonetheless, by the novel’s somewhat abrupt ending, it’s clear that time marches on, as will Pinky Granum.

From Los Angeles Times

An oil & gas pump jack is seen near Granum, Alberta, Canada May 6, 2020.

From Reuters

An oil & gas pump jack is seen near Granum, Alberta, Canada May 6, 2020.

From Reuters

Doug Granum of Southworth, who led the pole’s mid-1970s restoration, calls its removal tragic.

From Seattle Times