granum

noun

gra·​num ˈgrā-nəm 

plural grana ˈgrā-nə 

: one of the lamellar stacks of chlorophyll-containing thylakoids found in plant chloroplasts

Word History

Etymology

New Latin, from Latin, grain — more at corn

First Known Use

1894, in the meaning defined above

Kids Definition

granum

noun

gra·​num ˈgrā-nəm 

plural grana -nə 

: one of the stacks of chlorophyll-containing material in plant chloroplasts

Medical Definition

granum

noun

gra·​num ˈgrā-nəm  ˈgrä-nəm 

plural grana -nə 

: one of the lamellar stacks of chlorophyll-containing material in plant chloroplasts