focal epilepsy
focal infection
focal length
focal point
focal ratio
focal seizure
-- Focus --
focus group
focus on
Focus tube


Fo´cus   Pronunciation: fō´kŭs
n.1.(Opt.) A point in which the rays of light meet, after being reflected or refracted, and at which the image is formed; as, the focus of a lens or mirror.
2.(Geom.) A point so related to a conic section and certain straight line called the directrix that the ratio of the distance between any point of the curve and the focus to the distance of the same point from the directrix is constant.
3.A central point; a point of concentration.
Aplanatic focus
(Opt.) See under Aplanatic.
Conjugate focus
(Opt.) the focus for rays which have a sensible divergence, as from a near object; - so called because the positions of the object and its image are interchangeable.
Focus tube
(Phys.) a vacuum tube for Rœntgen rays in which the cathode rays are focused upon the anticathode, for intensifying the effect.
Principal focus
(Opt.) the focus for parallel rays.
v. t.1.To bring to a focus; to focalize; as, to focus a camera.
[imp. & p. p. Focused ; p. pr. & vb. n. Focusing.]
Noun1.focus - the concentration of attention or energy on something; "the focus of activity shifted to molecular biology"; "he had no direction in his life"
2.focus - maximum clarity or distinctness of an image rendered by an optical system; "in focus"; "out of focus"
3.focus - maximum clarity or distinctness of an idea; "the controversy brought clearly into focus an important difference of opinion"
4.focus - a central point or locus of an infection in an organism; "the focus of infection"
Synonyms: nidus, focal point
5.focus - special emphasis attached to something; "the stress was more on accuracy than on speed"
Synonyms: stress
6.focus - a point of convergence of light (or other radiation) or a point from which it diverges
Synonyms: focal point
7.focus - a fixed reference point on the concave side of a conic section
Verb1.focus - direct one's attention on something; "Please focus on your studies and not on your hobbies"
2.focus - cause to converge on or toward a central point; "Focus the light on this image"
blur - to make less distinct or clear; "The haze blurs the hills"
3.focus - bring into focus or alignment; to converge or cause to converge; of ideas or emotions
4.focus - become focussed or come into focus; "The light focused"
Synonyms: focalise, focalize
slur, blur, dim - become vague or indistinct; "The distinction between the two theories blurred"
5.focus - put (an image) into focus; "Please focus the image; we cannot enjoy the movie"
blear, blur - make dim or indistinct; "The drug blurs my vision"
(database, language)FOCUS - A hierarchical database language from Information Builders, Inc.
adductor, approach, asymptote, attractant, attrahent, axiom, blurred, blurry, bottleneck, bring into focus, center, center of attraction, center of consciousness, center of interest, clear, collision course, concenter, concentralization, concentralize, concentrate, concentration, concourse, concurrence, confluence, conflux, congress, converge, convergence, converging, core, crossing, cynosure, distinct, elixir, essence, essential, fix, fixate, flower, focal point, focalization, focalize, focus of attention, fundamental, funnel, fuzzy, gist, gravamen, heart, hub, hypostasis, in focus, indistinct, inner essence, kernel, lodestar, lure, magnet, marrow, meat, meet, meeting, mutual approach, narrowing gap, nave, nerve, nub, nucleus, nuts and bolts, out of focus, pinpoint, pith, point of convergence, polestar, postulate, prime focus, principle, put, quid, quiddity, quintessence, radius, rivet, sap, soul, spirit, spokes, spotlight, stuff, substance, tangent, target, the nitty-gritty, unclear, woolly, zero in
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