different between aperture vs arcus

English

Etymology

Borrowed from Latin apert?ra (“opening”), from apertus, past participle of aper?re (“to open, uncover”), opposed to oper?re (“to close, cover”). See aperient. Doublet of overture.

Pronunciation

• (Received Pronunciation) IPA^(key): /?æp.?.t??(?)/, /?æp.?.tj??(?)/
• (US) IPA^(key): /?æp.?.t??/
• Hyphenation: ap?er?ture

Noun

aperture (plural apertures)

1. A small or narrow opening, gap, slit, or hole.
   • 1860, Samuel Hannaford, Sea and River-side Rambles in Victoria Chapter 7

     In the centre of the fleshy membrane is an aperture leading into a deep cavity, at the bottom of which is placed a prominent piston that may be retracted by muscular fibres provided for the purpose.
2. (optics) Something which restricts the diameter of the light path through one plane in an optical system.
3. (astronomy, photography) The diameter of the aperture (in the sense above) which restricts the width of the light path through the whole system. For a telescope, this is the diameter of the objective lens.

4. (spaceflight, communication) The (typically) large-diameter antenna used for receiving and transmitting radio frequency energy containing the data used in communication satellites, especially in the geostationary belt. For a comsat, this is typically a large reflective dish antenna; sometimes called an array.
5. (mathematics, rare, of a right circular cone) The maximum angle between the two generatrices.

   If the generatrix makes an angle ? to the axis, then the aperture is 2?.

Usage notes

The aperture of microscopes is often expressed in degrees, called also the angular aperture, which signifies the angular breadth of the pencil of light which the instrument transmits from the object or point viewed; as, a microscope of 100° aperture.

Derived terms

Related terms

Translations

Further reading

• aperture in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.
• aperture in The Century Dictionary, New York, N.Y.: The Century Co., 1911.

French

Etymology

Borrowed from Latin apert?ra (“opening”). Doublet of ouverture.

Pronunciation

• IPA^(key): /a.p??.ty?/

Noun

aperture f (uncountable)

1. (phonetics, phonology) opening, openness, aperture

Related terms

• apéritif
• ouvrir

Further reading

• “aperture” in Trésor de la langue française informatisé (The Digitized Treasury of the French Language).

Italian

Pronunciation

• Rhymes: -ure

Noun

aperture f

1. plural of apertura

Anagrams

• reputare
• reputerà

Latin

Participle

apert?re

1. vocative masculine singular of apert?rus

Spanish

Verb

aperture

1. First-person singular (yo) present subjunctive form of aperturar.
2. Formal second-person singular (usted) present subjunctive form of aperturar.
3. Third-person singular (él, ella, also used with usted^?) present subjunctive form of aperturar.
4. Formal second-person singular (usted) imperative form of aperturar.

English

Etymology

Borrowed from Latin arcus. Doublet of arc and arco. Distantly related to arrow.

Noun

arcus (plural arc?s)

1. (medicine) A white band of cholesterol that forms at the edge of the cornea
2. (meteorology) A low, horizontal cloud typically forming at the leading edge of thunderstorm outflow
3. (entomology) An elastic band around the base of the arolium, a pad at the end of the leg of certain insects
4. (palynology) An arc-shaped band of thickened sexine extending between two apertures on a pollen grain or spore

Related terms

• arc
• arcuate
• arcus juvenilis
• arcus senilis

Translations

Anagrams

• Curas, carus, scaur

Latin

Etymology

From Proto-Indo-European *h?erk?o- (“bow, arrow”). Cognate to Old English earh, whence English arrow.

Pronunciation

• (Classical) IPA^(key): /?ar.kus/, [?ärk?s?]
• (Ecclesiastical) IPA^(key): /?ar.kus/, [??rkus]

Noun

arcus m (genitive arc?s); fourth declension

1. arc, arch
2. bow (arc-shaped weapon used for archery)
3. rainbow

Declension

Fourth-declension noun (dative/ablative plural in -ubus).

Derived terms

Related terms

• arcu?tus

Descendants

See also

• discus
• sagitta

References

• arcus in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
• arcus in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
• arcus in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition, 1883–1887)
• arcus in Gaffiot, Félix (1934) Dictionnaire illustré Latin-Français, Hachette
• arcus in Harry Thurston Peck, editor (1898) Harper's Dictionary of Classical Antiquities, New York: Harper & Brothers
• arcus in Ramminger, Johann (accessed 16 July 2016) Neulateinische Wortliste: Ein Wörterbuch des Lateinischen von Petrarca bis 1700?^[1], pre-publication website, 2005-2016
• arcus in William Smith et al., editor (1890) A Dictionary of Greek and Roman Antiquities, London: William Wayte. G. E. Marindin