Real Dictionary

dice
countable noun: A dice is a small cube which has between one and six spots or numbers on its sides, and which is used in games to provide random numbers. In old-fashioned English, 'dice' was used only as a plural form, and the singular was die, but now 'dice' is used as
uncountable noun: Dice is a game which is played using dice.
verb: If you dice food, you cut it into small cubes.

dice in American English
small cubes of bone, plastic, etc. marked on each side with a different number of spots (from one to six) and used, usually in pairs, in games of chance
to lose by gambling with dice
to play or gamble with dice
plural noun: small cubes of plastic, ivory, bone, or wood, marked on each side with one to six spots, usually used in pairs in games of chance or in gambling

dice in British English
plural noun: cubes of wood, plastic, etc, each of whose sides has a different number of spots (1 to 6), used in games of chance and in gambling to give random numbers