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WORDNET DICTIONARY
CIDE DICTIONARY
OXFORD DICTIONARY
THESAURUS
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 : 
Noun, Verb (usu participle)
 : 
fo=cus

WORDNET DICTIONARY

Noun has 7 senses

Verb has 5 senses

CIDE DICTIONARY

n. Array
  •  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.  [1913 Webster]
  •  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.  [1913 Webster]
  •  A central point; a point of concentration.  [1913 Webster]
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, or Solar focus (Opt.), the focus for parallel rays.
v. t. 
     To bring to a focus; to focalize; as, to focus a camera.  R. Hunt.  [1913 Webster]

OXFORD DICTIONARY

, n. & v.
--n. (pl. focuses or foci)
1 Physics a the point at which rays or waves meet after reflection or refraction. b the point from which diverging rays or waves appear to proceed. Also called focal point.
2 a Optics the point at which an object must be situated for an image of it given by a lens or mirror to be well defined (bring into focus). b the adjustment of the eye or a lens necessary to produce a clear image (the binoculars were not in focus). c a state of clear definition (the photograph was out of focus).
3 the centre of interest or activity (focus of attention).
4 Geom. one of the points from which the distances to any point of a given curve are connected by a linear relation.
5 Med. the principal site of an infection or other disease.
6 Geol. the place of origin of an earthquake.
--v. (focused, focusing or focussed, focussing)
1 tr. bring into focus.
2 tr. adjust the focus of (a lens, the eye, etc.).
3 tr. & intr. (often foll. by on) concentrate or be concentrated on.
4 intr. & tr. converge or make converge to a focus.

Derivative
focuser n.
Etymology
L, = hearth

THESAURUS

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

ROGET THESAURUS

Focus

N focus, point of convergence, corradiation, center, gathering place, resort haunt retreat, venue, rendezvous, rallying point, headquarters, home, club, depot, trysting place, place of meeting, place of resort, place of assignation, point de reunion, issue.

Centrality

N centrality, centricalness, center, middle, focus, core, kernel, nucleus, nucleolus, heart, pole axis, bull's eye, nave, navel, umbilicus, backbone, marrow, pith, vertebra, vertebral column, hotbed, concentration, centralization, symmetry, center of gravity, center of pressure, center of percussion, center of oscillation, center of buoyancy, metacenter, central, centrical, middle, azygous, axial, focal, umbilical, concentric, middlemost, rachidian, spinal, vertebral, middle, midst, centrally.

Furnace

N furnace, stove, kiln, oven, cracker, hearth, focus, combustion chamber, athanor, hypocaust, reverberatory, volcano, forge, fiery furnace, limekiln, Dutch oven, tuyere, brasier, salamander, heater, warming pan, boiler, caldron, seething caldron, pot, urn, kettle, chafing-dish, retort, crucible, alembic, still, waffle irons, muffle furnace, induction furnace, electric heater, electric furnace, electric resistance heat, open-hearth furnace, fireplace, gas fireplace, coal fire, wood fire, fire-dog, fire- irons, grate, range, kitchener, caboose, camboose, poker, tongs, shovel, ashpan, hob, trivet, andiron, gridiron, ashdrop, frying-pan, stew-pan, backlog, hearth, inglenook, oil burner, gas burner, Franklin stove, pot-bellied stove, wood-burning stove, central heating, steam heat, hot water heat, gas heat, forced hot air, electric heat, heat pump, solar heat, convective heat, hothouse, bakehouse, washhouse, laundry, conservatory, sudatory, Turkish bath, Russian bath, vapor bath, steam bath, sauna, warm bath, vaporarium.

See related words and definitions of word "" in Indonesian
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