focus


focus
1. (F) The point at which the light rays meet after passing through a convex lens. 2. The center, or the starting point, of a disease process. [L. a hearth]
- conjugate foci two points so related to a lens or concave mirror that an image at one point is focused at the other, and vice versa.
- Ghon f. SYN: Ghon tubercle.
- natural f. of infection an ecosystem in which an infectious agent normally persists in nature; e.g., yellow fever virus in a jungle monkey-Haemagogus mosquito ecosystem.
- principal f. the real or virtual meeting point of rays passing into a lens parallel to its axis.
- real f. the point of meeting of convergent rays.
- virtual f. the point from which divergent rays seem to proceed, or that at which they would meet if prolonged backward.

* * *

fo·cus 'fō-kəs n, pl fo·ci 'fō-.sīalso -.kī also fo·cus·es
1 a) a point at which rays (as of light, heat, or sound) converge or from which they diverge or appear to diverge specif the point where the geometrical lines or their prolongations conforming to the rays diverging from or converging toward another point intersect and give rise to an image after reflection by a mirror or refraction by a lens or optical system
b) a point of convergence of a beam of particles (as electrons)
2 a) FOCAL LENGTH
b) adjustment for distinct vision also the area that may be seen distinctly or resolved into a clear image
3) a localized area of disease or the chief site of a generalized disease or infection
focus vb, fo·cused also fo·cussed; fo·cus·ing also fo·cus·sing vt
1) to bring (as light rays) to a focus
2 a) to adjust the focus of (as the eye or a lens)
b) to bring (as an image) into focus vi
1) to come to a focus
2) to adjust one's eye or a camera to a particular range
fo·cus·able -kəs-ə-bəl adj

* * *

1. n. the point at which rays of light converge after passing through a lens.
2. n. the principal site of an infection or other disease.
3. vb. (in ophthalmology) to accommodate (see also accommodation).

* * *

fo·cus (foґkəs) pl. foґci [L. “fire-place”] 1. the point of convergence of light rays or of the waves of sound. 2. the chief center of a morbid process. 3. cardiac pacemaker.

Medical dictionary. 2011.

Synonyms:

Look at other dictionaries:

  • FOCUS — Beschreibung Nachrichtenmagazin Verlag Hubert Burda Media …   Deutsch Wikipedia

  • Focus — Saltar a navegación, búsqueda Para otros usos de este término véase Focus (desambiguación). Focus Información personal Origen Holanda Información artística …   Wikipedia Español

  • Focus — Beschreibung Nachrichtenmagazin Sprache …   Deutsch Wikipedia

  • Focus — may refer to:In science, mathematics or computing: *Focus (optics), a point toward which light rays are made to converge **Autofocus, a feature of some optical systems that obtains and maintains correct focus on a target **Focal length, a measure …   Wikipedia

  • Focus II — (Moving Waves) Studio album by Focus Released October 1971 …   Wikipedia

  • FOCUS — is a software product of Information Builders Inc. Originally developed for data handling and analysis on the IBM mainframe, as newer systems were developed and smaller computers became more powerful, the available platforms for FOCUS were… …   Wikipedia

  • Focus — Fo cus (f[=o] k[u^]s), n.; pl. E. {Focuses} (f[=o] k[u^]s*[e^]z), L. {Foci} (f[=o] s[imac]). [L. focus hearth, fireplace; perh. akin to E. bake. Cf. {Curfew}, {Fuel}, {Fusil} the firearm.] 1. (Opt.) A point in which the rays of light meet, after… …   The Collaborative International Dictionary of English

  • focus — fo‧cus [ˈfəʊkəs ǁ ˈfoʊ ] noun [uncountable] MARKETING when a company tries to serve particular groups of customers in a market with particular needs, rather than trying to serve the whole market focuser noun [countable] : • The focuser seeks to… …   Financial and business terms

  • Focus TV — Produktions GmbH Rechtsform GmbH Co. KG Gründung 1995 …   Deutsch Wikipedia

  • focus — [fō′kəs] n. pl. focuses or foci [fō′sī΄] [ModL, adopted in math. senses by KEPLER Johannes (1604) < L, fireplace, hearth < ? IE base * bhok , to flame, burn > ? Arm boc̣, flame] 1. the point where rays of light, heat, etc. or waves of… …   English World dictionary

  • FOCUS — микропроцессор производства компании 1982 году. Стал первым коммерческим, однокристальным, полностью 32 битным ЦПУ выпущенным на рынок. В то время все 32 битные микропроцессоры конкурентов (DEC, микросхем, составлявших модульную конструкцию ЦПУ.… …   Википедия


Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.