Fr.: position catalogue
Same as catalog position and → mean catalog place.
Fr.: position catalogue
Same as catalog place and → mean catalog place.
A great, often sudden calamity; a complete failure; a sudden violent change in the earth's surface. → cataclysm.
From Gk. katastrophe "an overturning, ruin," from katastrephein "to overturn, ruin" from kata "down" + strephein "to turn."
Negunzâr, from negun "overturned, inverted" + -zâr suffix denoting profusion, abundance, as in kârzâr "a field of battle; combat" šurezâr "unfertile, salty ground; nitrous earth," xoškzâr "arid land," and so forth.
The doctrine that certain vast geological changes in the Earth's history were caused by sudden, short-lived, violent events rather than gradual evolutionary processes. Catastrophism explains the differences in → fossil forms encountered in successive → stratigraphic levels. This doctrine is associated with the French naturalist Baron Georges Cuvier (1769-1832). Catastrohism is contrasted to the → uniformitarianism.
1) Unambiguously explicit and direct, without exceptions or conditions.
Fr.: proposition catégorique
In a → syllogism, a → proposition or statement that deals with inclusion or exclusion of members of → subject classes in → predicate classes. Categorical propositions are of four basic forms, see → Aristotelian form.
Fr.: syllogisme catégirique
A standard → syllogism that consists of three → categorical propositions in which there are three terms, and each term appears exactly twice. The three terms in a standard categorical syllogism are the → major term, → mino term, and → middle term.
To place in a → category or class.
1) A group of things that are similar in some way.
M.Fr. catégorie, from L.L. categoria, from Gk. kategoria, from kategorein "to speak against; to accuse, assert, predicate," from kata "down, against, back," → cata-, + agorein "to speak before public assembly," from agora "marketplace, public square" (from ageirein "to gather"); cognate with L. grex, gregis "herd, troop, crowd;" Skt. gramah- "heap, crowd, community;" Old Icelandic kremja "to squeeze;" O.E. crammian "to cram;" Latvian gùrste "bundle of flask;" Polish garnac "to gather;" Russ. gorst' "cupped hand;" cf. Pers. gor-, gal-, etc., as below; PIE base *ger- "to gather."
Katâgor, from katâ-, → cata-,
+ gor- "to gather," ultimately from PIE *ger-, as above. We put forward that the
following Iranian words derive from the above PIE base *ger- "to gather":
Fr.: théorie des catégories
A negatively charged electrode that is the source of electrons in an electrical device.
Gk. kathodos "descent, a way down," from kata- "down" + hodos "way, path."
partw-e kâtodi (#)
Fr.: rayon cathodique
A kind of ray generated at the cathode in a vacuum tube, by the electrical discharge.
→ cathode; →ray.
Fr.: astrolabe catholique
Same as → universal astrolabe.
Catholic, M.E., from Fr. catholique, from Church Latin catholicus "universal, general," from Gk. katholikos, from phrase kath' holou "on the whole, in general," from kata "about," → cata-, + genitive of holos "whole," → holo-; → astrolabe.
Fr.: lumière catoptrique
Light that is reflected from a curved surface mirror.
Fr.: système catoprtique
An optical system in which the light is reflected only.
The area of → optics which treats of the laws and properties of light reflected from reflective surfaces.
Domesticated quadrupeds held on a farm, especially oxen, bulls, and cows.
M.E. catel, from M.Fr. catel "property" (O.Fr. chatel), from M.L. capitale "property, stock," from L. capitalis "principal, chief," literally "of the head," from caput, → head.
Dâm, originally "nonferocious animal," especially "herbivorous quadrupeds such as cows, sheep, etc.;" Mid.Pers. dâm "creature, creation;" O.Pers. dā- "to put, make, create;" Av. dā- "to place, put, create," dāmay- "creation; creating; creator," dāmi.dāt- "creating the creation;" cf. Skt. dhā- "to put, to place;" Gk. tithemi "to put, to place;" L. facere "to do;" O.H.G. tuon; E. to do.
Fr.: équation de Cauchy
A relationship between the → refractive index (n) and the wavelength of light (λ) passing through a medium. It is commonly stated in the following form: n = A + B/λ2 + C/λ4, where A, B, and C are constants characterizing the medium. The two-component Cauchy equation is n = A + B/λ2, from which the dispersion becomes dn/dλ = -2B/λ3 showing that dispersion varies approximately as the inverse cube of the wavelength. The dispersion at 4000 A will be about 8 times as large as at 8000 Å.
Named after Augustin Louis Cauchy (1789-1857), French mathematician and physicist who found the first equation of dispersion in 1836; → equation.
Fr.: théorème de Cauchy
If f(x) and φ(x) are two → continuous functions on the → interval [a,b] and → differentiable within it, and φ'(x) does not vanish anywhere inside the interval, there will be found, in [a,b], some point x = c, such that [f(b) - f(a)] / [φ(b) - φ(a)] = f'(c) / φ'(c).