What does buccellārius mean in Latin?

buccellārius, a noun, means “bucellarius”.

What is the genitive of buccellārius?

The genitive singular is buccellāriī. buccellārius is masculine, second declension.

noun · masculinesecond declension

buccellārius m (genitive buccellāriī or buccellārī)

buccella + -ārius, literally, “biscuit-eater”, from the name of soldiers' rations.