different between locus vs conchoid

English

Etymology

Borrowed from Latin locus.

Pronunciation

• (Received Pronunciation) IPA^(key): /?l??k?s/
• (General American) IPA^(key): /?lo?k?s/
• Rhymes: -??k?s

Noun

locus (plural loci)

1. A place or locality, especially a centre of activity or the scene of a crime.

2. (mathematics) The set of all points whose coordinates satisfy a given equation or condition.

3. (genetics) A fixed position on a chromosome that may be occupied by one or more genes.
4. (chiefly in the plural) A passage in writing, especially in a collection of ancient sacred writings arranged according to a theme.

Usage notes

• Sometimes confused with locust.

Derived terms

• homeolocus
• method of loci
• superlocus

Related terms

• local
• locality
• localization
• localize
• locate
• location
• locator

Translations

Anagrams

• ULOCs, clous

Latin

Etymology

From older stlocus, from Proto-Italic *stlokos, from Proto-Indo-European *stel- (“to put, place, locate”).

Pronunciation

• (Classical) IPA^(key): /?lo.kus/, [????k?s?]
• (Ecclesiastical) IPA^(key): /?lo.kus/, [?l??kus]

Noun

locus m (genitive loc?); second declension

1. place, spot (a specific location)
2. a passage of literature
3. in the plural with neuter gender: a region or general geographic area

Declension

Second-declension noun (otherwise or neuter).

The inflection is irregular. For senses one and two, the declension follows the regular masculine pattern. For sense three, the plural forms become neuter in gender and form.

Derived terms

Descendants

References

• locus in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
• locus in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
• locus in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition, 1883–1887)
• locus in Gaffiot, Félix (1934) Dictionnaire illustré Latin-Français, Hachette
• Carl Meissner; Henry William Auden (1894) Latin Phrase-Book?^[1], London: Macmillan and Co.

Spanish

Etymology

Borrowed from Latin locus. Doublet of luego.

Noun

locus m (plural loci)

1. (genetics) locus

English

Etymology

From Latin concha (“mussel”) (from Ancient Greek ????? (kónkh?)) +? -oid or directly from Ancient Greek ?????????? (konkhoeid?s), referring to the curved outline of a mussel shell or anything in this form.

Noun

conchoid (plural conchoids)

1. (mathematics, geometry) Any of a family of curves defined as the locus of points p, such that each p is on a line that passes through a given fixed point P and intersects a given curve, C, and the distance from p to the point of intersection with C is a specified constant (note that for nontrivial cases two such points p satisfy the criteria, and the resultant curve has two parts).

   The conchoid of a circle with respect to a point on the circle is a cardioid if the fixed distance is equal to the diameter of the circle.

   The Conchoid of Nicomedes is the conchoid of a straight line with respect to a point not on the line.

   • 1815, Charles Hutton, Pappus, entry in A Philosophical and Mathematical Dictionary, Volume 2, page 147,

     He next treats of the properties of the Conchoid, which Nicomedes invented for doubling the cube; applying it to the solution of certain problems concerning Inclinations, with the finding of two mean proportionals, and cubes in any proportion whatever.
2. (geology) A conchoidal fracture in rock.
   • 1948, Tennessee Valley Authority, The Hiwassee Valley Projects, Technical Report, Issue 5, Volume 2, page 359,

     Conchoids of sound rock, from a few feet to 20 or more feet in diameter, entirely surrounded by comparatively thin layers of weathered material, were frequently encountered, sometimes in adjacent series.

Usage notes

The fixed point (P) of the construction may be referred to as the focus of the conchoid; it may also be defined as the origin (of a Cartesian coordinate system) or the pole (if polar coordinates are used), and potentially referred to accordingly. The curve C is an example of a directrix.

Derived terms

• conchoid of de Sluze (strictly a cissoid)
• conchoid of Dürer (not actually a conchoid)
• conchoid of Nicomedes

Related terms

• conchoidal

Translations

See also

• cardioid
• cissoid
• limaçon
• strophoid