Definition of grammas:
(n) :
(colloquial) A grandmother.
(n) :
Something that is written.
(n) :
The subjects of reading, writing, and arithmetic.
(n) :
(Australia) A variety of pumpkin, a cultivar of Cucurbita moschata.
(n) :
A nickname for a grandmother.
(n) :
Alternative form of grama. [Various species of grass in the genus Bouteloua, including Bouteloua gracilis (blue grama)]