Etymology
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Helga 
fem. proper name, from Old Norse Helga, literally "holy," from Proto-Germanic *hailaga, from PIE *kailo- (see health). A doublet of Olga.
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fluoridation (n.)
1904, "process of absorbing fluoride," from fluoride + -ation. In reference to adding traces of fluoride to drinking water as a public health policy, from 1949.
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spa (n.)
"medicinal or mineral spring," 1620s, from the name of the health resort in eastern Belgium, known since 14c., that features mineral springs believed to have curative properties. The place name is from Walloon espa "spring, fountain." As "commercial establishment offering health and beauty treatments," 1960.
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premier (n.)

1711 in the political sense, "the first minister of a state," a shortening of premier minister (1680s); see premier (adj.). In U.S. usage, premier formerly was applied occasionally to the Secretary of State (late 19c.).

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toast (n.2)

"a call to drink to someone's health," 1690s (but said by Steele, 1709, to date to the reign of Charles II), originally referring to the beautiful or popular woman whose health is proposed and drunk to. The custom apparently has its origin in the use of spiced toast (n.1) to flavor drink; the lady being regarded as figuratively adding piquancy to the wine which was drunk to her health. 

The custom itself is much older than this word for it, and the expectation of a bit of toast in a mug of ale at a tavern is well attested in many 17c. drinking songs, though none of them seems to give a reason for it. 

Steele's story ["Tatler," No. 24] is that an (unnamed) beauty of the day was taking the cold waters at Bath, when a gentleman dipped his cup in the water and drank it to her health; another in his company wittily (or drunkenly) replied that, while he did not care for the drink, he would gladly enjoy the toast. Meaning "one whose health is proposed and drunk to" is from 1746. Toast-master attested from 1749.

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Olga 

fem. proper name, Russian, probably from Norse Helga, literally "holy," from Proto-Germanic *hailaga (from PIE *kailo-; see health). The masc. form is Oleg.

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fletcherism (n.)
dietary system emphasizing very thorough mastication, 1903, from -ism + name of Horace Fletcher (1849-1919), U.S. health enthusiast. Related: Fletcherize; fletcherized.
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restorative (adj.)

"capable of restoring health or strength," late 14c., restoratif, from Old French restoratif, restauratif, from restorer (see restore) or from Medieval Latin restaurativus.

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unhealthy (adj.)
1590s, "injurious to health," from un- (1) "not" + healthy (adj.). Earlier unhealthsome (1540s), unhealthful (1570s). Of persons, "sickly," it is attested from 1610s. Related: Unhealthily.
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macadamia (n.)

Australian evergreen tree, commercially important for its edible nut, 1904, from Modern Latin (1858), named for Scotland-born chemist Dr. John Macadam, secretary of the Victoria Philosophical Institute, Australia, + abstract noun ending -ia.

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