Any of several varieties of squash, Cucurbita pepo, bearing small, usually round fruit; specifically (more fully "little gem squash") one with orange flesh and a dark green skin ripening to orange, grown especially in South Africa.
Origin
Late 19th century.
Definition of gem squash in US English:
gem squash
noun
Any of several varieties of squash, Cucurbita pepo, bearing small, usually round fruit; specifically (more fully "little gem squash") one with orange flesh and a dark green skin ripening to orange, grown especially in South Africa.