n, pl  fo*ci  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
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 adj 
 
 
 
Similar sounding terms:  FACS  FICS   fix  fu·cose 
 
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