grocer n.

mid-14c., "large;" early 15c., "thick," also "coarse, plain, simple," from Old French gros "big, thick, fat; tall; strong, powerful; pregnant; coarse, rude, awkward; ominous, important; arrogant" (11c.), from Late Latin grossus "thick, coarse" (of food or mind), in Medieval Latin "great, big" (source also of Spanish grueso, Italian grosso), a word of obscure origin, not in classical Latin. It is said to be unrelated to Latin crassus, which meant the same thing, or to German gross "large," but said by Klein to be cognate with Old Irish bres, Middle Irish bras "big."

Its meaning forked in English. Via the notion of "coarse in texture or quality" came the senses "not sensitive, dull stupid" (1520s), "vulgar, coarse in a moral sense" (1530s). Via the notion of "general, not in detail" came the sense of "entire, total, whole, without deductions" (early 15c.), as in gross national product (1947). The meaning "glaring, flagrant, monstrous" is from 1580s; modern meaning "disgusting" is first recorded 1958 in U.S. student slang, from earlier use as an intensifier of unpleasant things (gross stupidity, etc.).

1723, from green (n.) "vegetable" + grocer.

mid-15c., "goods sold by a grocer;" earlier the name of the Grocer's Hall in London (early 15c.), from Old French grosserie, from grossier "wholesale merchant" (see grocer). Meaning "a grocer's shop" is by 1803, especially in American English, where its use in that sense restricted the "goods sold by a grocer" meaning to the plural, groceries, by mid-19c.

GROCERY. A grocer's shop. This word is not in the English dictionaries except in the sense of grocer's ware, such as tea, sugar, spice, etc.; in which sense we also use it in the plural. [Bartlett, "Dictionary of Americanisms," 1859]

Self-service groceries were a novelty in 1913 when a Montana, U.S., firm trademarked the word groceteria (with the ending from cafeteria used in an un-etymological sense) to name them. The term existed through the 1920s.