Etymology
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gran (1)
childish abbreviation of grandmother or granny, 1863.
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gran (2)
Italian, the form of grand before nouns.
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Colombia 

South American nation, independent from 1819 as part of Gran Colombia (after its breakup in 1830, known as New Granada, then Colombia from 1863); named for Italian explorer Christopher Columbus (Italian Colombo, Portuguese Colom, Spanish Colón). Related: Colombian.

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gangrene (n.)

"putrefaction or necrosis of soft tissues," 1540s, cancrena, from Latin gangraena (Medieval Latin cancrena), from medical Greek gangraina "an eating or gnawing sore," literally "that which eats away," a dissimilated, reduplicated form of gran- "to gnaw," from PIE root *gras- "to devour" (see gastric).

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gramercy (interj.)
c. 1300, exclamation of thanks, later of surprise, from Old French grant-merci, gran merci "great thanks, many thanks," from gran (see grand (adj.)) + merci "reward, favor, thanks" (see mercy (n.)). Modern French merci "thank you" is a shortening of this.

New York City's Gramercy Park is named for the Gramercy Farm which once stood there; the first part of the name is an 18c. folk-etymology from Crommeshie Fly, the name of a former marsh or shallow pond that stood nearby, itself a mangling of New Netherlands Dutch Crommessie Vly, the first part of which represents either *Krom Moerasje "little crooked swamp" or *Krom Messje "little crooked knife," said to have been the name of a brook flowing into (or out of) the pond.
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gastric (adj.)
1650s, from Modern Latin gastricus, from Greek gaster (genitive gastros) "stomach, paunch, belly," often figurative of gluttony or greed, also "womb, uterus; sausage," by dissimilation from *graster, literally "eater, devourer," from gran "to gnaw, eat," from PIE root *gras- "to devour" (source also of Greek grastis "green fodder," Latin gramen "fodder, grass," Old English cærse "cress").
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