Etymology
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SALT (n.)

Cold War U.S.-U.S.S.R. nuclear weapons negotiations, 1968, acronym for Strategic Arms Limitation Talks (which would make SALT talks redundant, but the last element sometimes also is understood, especially after their outcome, as treaty).

salt (n.)

Old English sealt "salt, sodium chloride, abundant substance essential to life, used as a condiment and meat preservative," from Proto-Germanic *saltom (source also of Old Saxon, Old Norse, Old Frisian, Gothic salt, Dutch zout, German Salz), from PIE root *sal- "salt."

Applied from early 14c. to various substances resembling common salt. Modern chemistry sense "compound of an acid radical with a base radical" is from 1790; as an ultimate element in alchemy from 1580s. Meaning "experienced sailor" is attested by 1840 (Dana), probably a reference to the salinity of the sea. By 1570s as "that which gives piquancy to discourse or writing or liveliness to a person's character."

Salt long was regarded as having power to repel spiritual and magical evil. Many metaphoric uses reflect that this was once a rare and important resource, such as worth one's salt "efficient, capable" (1830), salt of the earth "persons of worthiness" (Old English, after Matthew v.13). Belief that spilling salt brings bad luck is attested from 16c. To be above (or below) the salt (1590s) refers to customs of seating at a long table according to rank or honor, and placing a large salt-cellar in the middle of the dining table.

Salt-shaker is from 1882. Salt-and-pepper (adj.) "of dark and light color" is by 1915 (pepper-and-salt, 1774, was an old name for a kind of cloth made from dark and light colored wools woven together). To take something with a grain of salt "accept with a certain amount of reserve" is from 1640s, from Modern Latin cum grano salis. The notion is perhaps "modification," hence "allowance, abatement, reserve."

salt (v.)

Middle English salten, "prepare with salt, preserve (something) with salt," from Old English sealtan, from Proto-Germanic *salto- (see salt (n.)), and in part from the noun. Related: Salted; salting.

salt (adj.)

Old English sealt, "salty, briny, containing salt," from Proto-Germanic *saltoz-, from the source of salt (n.). By c. 1300 as "treated with or preserved with salt" (salt fish).

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Definitions of SALT
1
salt (v.)
add salt to;
salt (v.)
sprinkle as if with salt;
the rebels had salted the fields with mines and traps
salt (v.)
add zest or liveliness to;
She salts her lectures with jokes
salt (v.)
preserve with salt;
people used to salt meats on ships
2
salt (n.)
a compound formed by replacing hydrogen in an acid by a metal (or a radical that acts like a metal);
salt (n.)
white crystalline form of especially sodium chloride used to season and preserve food;
Synonyms: table salt / common salt
salt (n.)
negotiations between the United States and the Union of Soviet Socialist Republics opened in 1969 in Helsinki designed to limit both countries' stock of nuclear weapons;
Synonyms: Strategic Arms Limitation Talks
salt (n.)
the taste experience when common salt is taken into the mouth;
Synonyms: saltiness / salinity
3
salt (adj.)
(of speech) painful or bitter; "salt scorn"- Shakespeare;
a salt apology
From wordnet.princeton.edu