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.
DIOPTER
diopter, dioptre
(noun) a unit of measurement of the refractive power of a lens which is equal to the reciprocal of the focal length measured in meters; used by oculists
Source: WordNet® 3.1
Etymology
Noun
diopter (plural diopters)
A unit of measure of the power of a lens or mirror, equal to the reciprocal of its focal length in meters. Myopia is diagnosed and measured in diopters.
The dioptre adjustment mechanism of a pair of binoculars.
(obsolete) Any lens system, such as a telescope.
(obsolete) A theodolite or similar surveyor’s angle measuring device.
(obsolete) An alidade.
(obsolete) A surgical speculum.
(obsolete) An instrument for drawing the skull by projections.
Anagrams
• dioptre, peridot, periodt, proetid, proteid, protide, pterido-, pteroid, reptoid
Source: Wiktionary
Di*op"ter, Di*op"tra, n. Etym: [L. dioptra, fr. Gr. Dioptric.]
Definition: An optical instrument, invented by Hipparchus, for taking altitudes, leveling, etc.
Source: Webster’s Unabridged Dictionary 1913 Edition
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MALLET
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