In 1884, Angelo Moriondo of Turin, Italy, demonstrated the first working example of an espresso machine.
TETRAVALENT
tetravalent
(adjective) haveing a valence of four
Source: WordNet® 3.1
Etymology
Adjective
tetravalent (not comparable)
(chemistry) Having an atomic valence of 4.
(medicine) Having a vaccine valence of 4.
Synonyms
• quadrivalent
Source: Wiktionary
Te*trav"a*lent, a. Etym: [Tetra- + L. valens, -entis, p.pr.] (Chem.)
Definition: Having a valence of four; tetratomic; quadrivalent.
Source: Webster’s Unabridged Dictionary 1913 Edition
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