Gammon in British English is the hind leg of pork after it has been cured by dry-salting or brining, and may or may not be smoked. Strictly speaking, a gammon is the bottom end of a whole side of bacon (which includes the back leg), ham is just the back leg cured on its own. Like bacon it must be cooked before it can be eaten; in that sense gammon is comparable to fresh pork meat, and different from dry-cured ham like prosciutto. The term is mostly used in the United Kingdom and Ireland; other dialects of English largely make no distinction between gammon and ham.
In the United Kingdom and Ireland, joints of cooked gammon are often served at Christmas. It can be found in most supermarkets either as a full joint or sliced into steaks, which can then be cooked via pan frying in a manner similar to bacon.
The word 'gammon' is derived from the Middle English word for 'ham', gambon, which is attested since the early 15th century and derived from Old North French gambon, itself derived from Old French jambon, which is identical to the modern French word for 'ham'. Old French jambon is attested since the 13th century and is derived from Old French jambe (gambe in Old North French) which in turn is derived from the Late Latin gamba, meaning 'leg/hock of a horse/animal'. Gamba can be traced to Greek kampe meaning 'a bending/a joint', which is from Proto-Indo-European *kamp- (“to bend; crooked”). In some English dialects 'gambol', which is similarly derived, refers to a 'leg'.
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- "gambol - Origin and meaning of gambol by Online Etymology Dictionary". www.etymonline.com.