Why is Onigiri called so? and its literal Meaning
As I wrote in the previous post, onigiri is a rice ball dish different from nigiri. The latter is a style of sushi, but onigiri is not.
Some people might be wondering why onigiri is not the polite form of the word nigiri, as the polite way to say sushi is o-sushi.
Why is it called onigiri (おにぎり)?
Based on those sources, the origin of the word onigiri is derived from the act of grasping rice, meaning “ご飯を握る” in Japanese.
In ancient Japan, rice was called “飯/いひ (ihi)”, and “握飯/にぎりいい (nigirii)” was the word for onigiri.
Later, the pronunciation nigirii changed into nigiri-meshi (literally meaning grasped rice), and it is considered, as its feminine expression, onigiri came to be used.
Even now, nigiri-meshi is used as a synonym of onigiri, and given the context above, the literal meaning of both is “grasped rice”.