In 1884, Angelo Moriondo of Turin, Italy, demonstrated the first working example of an espresso machine.
FLUORIDE
fluoride
(noun) a salt of hydrofluoric acid
Source: WordNet® 3.1
Etymology
Noun
fluoride (plural fluorides)
(chemistry) Any salt of hydrofluoric acid; for example, potassium fluoride.
(chemistry) A binary compound of fluorine and another element or radical.
Source: Wiktionary
Flu"or*ide ( or ; 104), n. Etym: [Cf. F. fluoride.] (Chem.)
Definition: A binary compound of fluorine with another element or radical. Calcium fluoride (Min.), fluorite, CaF2. See Fluorite.
Source: Webster’s Unabridged Dictionary 1913 Edition
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SET
(noun) an unofficial association of people or groups; “the smart set goes there”; “they were an angry lot”
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