dioptrical (comparative more dioptrical, superlative most dioptrical)
Alternative form of dioptric
dioptrical principles
Source: Wiktionary
Di*op"tric, Di*op"tric*al, a. Etym: [Gr. dioptrique.]
Definition: Of or pertaining to dioptrics; assisting vision by means of the refraction of light; refractive; as, the dioptric system; a dioptric glass or telescope. "Dioptrical principles." Nichol. Dioptric curve (Geom.), a Cartesian oval. See under Cartesian.
Source: Webster’s Unabridged Dictionary 1913 Edition
6 March 2025
(noun) the two innermost layers of the meninges; cerebrospinal fluid circulates between these innermost layers
The first coffee-house in Mecca dates back to the 1510s. The beverage was in Turkey by the 1530s. It appeared in Europe circa 1515-1519 and was introduced to England by 1650. By 1675 the country had more than 3,000 coffee houses, and coffee had replaced beer as a breakfast drink.
