Having two foci.
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bi·fo·cal (')bī-'fō-kəl adj
1) having two focal lengths
2) having one part that corrects for near vision and one for distant vision <a \bifocal eyeglass lens>
bifocal n
1) a bifocal glass or lens
2) bifocals pl eyeglasses with bifocal lenses
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bi·fo·cal (bi-foґkəl) (biґfo-kəl) 1. having two foci. 2. containing one part for near vision and another part for distant vision; see under lens.Medical dictionary. 2011.