There are four varieties of commercially viable coffee: Arabica, Liberica, Excelsa, and Robusta. Growers predominantly plant the Arabica species. Although less popular, Robusta tastes slightly more bitter and contains more caffeine.
HERTZ
Hertz, Gustav Hertz, Gustav Ludwig Hertz
(noun) German physicist who with James Franck proved the existence of the stationary energy states postulated by Bohr (1887-1975)
Hertz, Heinrich Hertz, Heinrich Rudolph Hertz
(noun) German physicist who was the first to produce electromagnetic waves artificially (1857-1894)
hertz, Hz, cycle per second, cycles, second, cps, cycle
(noun) the unit of frequency; one hertz has a periodic interval of one second (named for Heinrich Rudolph Hertz)
Source: WordNet® 3.1
Etymology
Named after the German physicist Heinrich Rudolf Hertz.
Noun
hertz (plural hertz or hertzes)
In the International System of Units, the derived unit of frequency; one (period or cycle of any periodic event) per second. Symbol: Hz
Synonyms
• cycle per second
Etymology
Proper noun
Hertz (plural er-noun)
A surname.
Noun
Hertz (uncountable)
Alternative letter-case form of hertz (āHzā)
Source: Wiktionary
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2 May 2025
MINESHAFT
(noun) excavation consisting of a vertical or sloping passageway for finding or mining ore or for ventilating a mine
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