English-Thai Dictionary
conchoid
N กราฟ รูป เส้น ลาย หอย
Webster's 1828 Dictionary
CONCHOID
n.[Gr. , form. ] The name of a curve, given to it by its inventor Nicomedes.
CONCHOIDAL
a.In mineralogy, resembling a conch or marine shell; having convex elevations and concave depressions, like shells; as a conchoidal fracture.
Webster's 1913 Dictionary
CONCHOID
Con "choid, n. Etym: [Gr. conchoïde.] (Geom.)
Defn: A curve, of the fourth degree, first made use of by the Greek geometer, Nicomedes, who invented it for the purpose of trisecting an angle and duplicating the cube.
CONCHOIDAL
Con *choid "al, a. Etym: [Cf. F. conchoïdal.] (Min. )
Defn: Having elevations or depressions in form like one half of a bivalve shell; -- applied principally to a surface produced by fracture.
New American Oxford Dictionary
conchoid
con choid |ˈkäNGˌkoid ˈkɑŋkɔɪd | ▶noun Mathematics a plane quartic curve consisting of two separate branches either side of and asymptotic to a central straight line (the asymptote ), such that if a line is drawn from a fixed point (the pole ) to intersect both branches, the part of the line falling between the two branches is of constant length and is exactly bisected by the asymptote. [Such curves are represented by the general equation ( x − a )2 ( x 2 + y 2 ) = b 2 x 2, where a is the distance between the pole and the asymptote, and b is the constant length. The branch on the same side of the asymptote as the pole typically has a cusp or loop. ] ORIGIN early 18th cent.: from conch + -oid .
conchoidal
con choi dal |käNGˈkoidl kɑŋˈkɔɪdl | ▶adjective chiefly Mineralogy denoting a type of fracture in a solid (such as flint or quartz ) that results in a smooth rounded surface resembling the shape of a scallop shell.
Oxford Dictionary
conchoid
conchoid |ˈkɒŋkɔɪd | ▶noun Mathematics a plane quartic curve consisting of two separate branches either side of and asymptotic to a central straight line (the asymptote ), such that if a line is drawn from a fixed point (the pole ) to intersect both branches, the part of the line falling between the two branches is of constant length and is exactly bisected by the asymptote. ●Such curves are represented by the general equation ( x − a )2 ( x 2 + y 2 ) = b 2 x 2, where a is the distance between the pole and the asymptote, and b is the constant length. The branch on the same side of the asymptote as the pole typically has a cusp or loop. ORIGIN early 18th cent.: from conch + -oid .
conchoidal
conchoidal |kɒŋˈkɔɪd (ə )l | ▶adjective chiefly Mineralogy denoting a type of fracture in a solid (such as flint ) which results in a smooth rounded surface resembling the shape of a scallop shell.
The Wordsmith Dictionary