Definition of mossberry in US English:

mossberry

noun

  • Any of various small berries growing on marshy ground or in mossy areas; specifically (a) a species of cranberry, Vaccinium oxycoccos, or its fruit; (b) North American regional (Alaska and Canadian) the crowberry, Empetrum nigrum, or its fruit.

Origin

Late 17th century; earliest use found in John Ray (1627–1705), naturalist and theologian. From moss + berry.