(optics, of a lens) Having surfaces with the same radius of curvature.
equinox
equinox
noun
(also figuratively) The circumstance of a twenty-four hour time period having the day and night of equal length.
(astronomy) A celestial equator (“great circle on the celestial sphere, coincident with the plane of the Earth's equator (the equatorial plane)”); also, the Earth's equator.
(astronomy) One of the two points in space where the apparent path of the Sun intersects with the equatorial plane of the Earth.
(rare) A gale (“very strong wind”) once thought to occur more frequently around the time of an equinox (sense 1), now known to be a misconception; an equinoctial gale.
One of the two occasions in the year when the length of the day and night are equal, which occurs when the apparent path of the Sun (the ecliptic) intersects with the equatorial plane of the Earth; this happens on a day between March 19 and 21 (spring in the Northern Hemisphere, and autumn in the Southern Hemisphere), and on another day between September 21 and 24 (autumn in the Northern Hemisphere, and spring in the Southern Hemisphere); hence, the exact time when the intersection occurs.
equinoxes
equinoxes
noun
plural of equinox
plural of equinoxe
hydroxyanthraquinone
hydroxyanthraquinone
noun
(organic chemistry) Any of several organic compounds that can be viewed as derivatives of an anthraquinone through replacement of one hydrogen atom by a hydroxyl group.
oxyanthraquinone
oxynaphtoquinone
oxyquinaseptol
oxyquinaseptol
noun
Synonym of diaphtherin
oxyquinoline
oxyquinoline
noun
(organic chemistry) Hydroxy quinoline; a phenol derivative of quinoline.
oxyquinone
quinatoxin
quinatoxine
quinotoxine
quinotoxine
noun
(organic chemistry) A derivative of quinine that has a historical importance in the synthesis of the drug
quinoxalin
quinoxaline
quinoxaline
noun
(organic chemistry) A bicyclic heterocycle consisting of a benzene ring fused to that of pyrazine.
quinoxalyl
squaxon
sulfaquinoxaline
sulfaquinoxaline
noun
(pharmacology) A drug used in veterinary medicine to treat coccidiosis.
unquixotic
unquixotic
adj
Not quixotic.
unquixotical
unquixotically
xyloquinone
xyloquinone
noun
(organic chemistry) Any of a group of quinone compounds obtained by the oxidation of xylidines.
