bifocal

from WordNet (r) 3.0 (2006)
bifocal
    adj 1: having two foci; "bifocal eyeglasses"
from The Collaborative International Dictionary of English v.0.48
Bifocal \Bi"fo`cal\, n. [Pref. bi-+ focal.]
   a bifocal lens.
   [PJC]
from The Collaborative International Dictionary of English v.0.48
Bifocal \Bi"fo`cal\, a. [Pref. bi-+ focal.]
   Having two foci, as some spectacle lenses.
   [Webster 1913 Suppl.]
antiflux / dictionary / bifocal
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