| bifocal lens | A lens used in cases of presbyopia, in which one portion is suited for distant vision, the other for reading and close work in general; the reading addition may be cemented to the lens, fused to the front surface, or ground in one-piece form; other bifocal lens's are the flat-top Franklin type, or blended invisible. (05 Mar 2000) |
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| bifocal spectacles | Spectacles with bifocal lenses. See: lens. (05 Mar 2000) |
| bifoliate | Of plants: having two leaves. (09 Oct 1997) |
| bifoliolate | Refers to leaves that have two leaflets. (09 Oct 1997) |
| biforate | <botany> Having two perforations. Origin: L. Bis twice + foratus, p. P. Of forare to bore or pierce. Source: Websters Dictionary (01 Mar 1998) |
| biforate uterus | Septate uterus in which the cervix is divided into two by a septum. Synonym: double-mouthed uterus, uterus biforis. (05 Mar 2000) |
| biforine | <botany> An oval sac or cell, found in the leaves of certain plants of the order Araceae. It has an opening at each end through which raphides, generated inside, are discharged. Origin: L. Biforis, biforus, having two doors; bis twice + foris door. Source: Websters Dictionary (01 Mar 1998) |
| bifoveal fixation | A condition in which both eyes are simultaneously directed to the same target. Synonym: bifoveal fixation. (05 Mar 2000) |
| bifunctional | Referring to a molecule containing two reactive functional groups; cross-linking reagents are bifunctional compounds. (05 Mar 2000) |
| bifurcate | Bifurcated Forked; two-pronged; having two branches. Origin: bi-+ L. Furca, fork (05 Mar 2000) |
| bifurcate ligament | <anatomy> A strong V-shaped ligament on the dorsum of the foot that passes from the calcaneus distal to the tarsal sinus and attaches to cuboid and navicular bones; it is divided into the dorsal calcaneocuboid ligament and the calcaneonavicular ligament. Synonym: ligamentum bifurcatum, bifurcated ligament. (05 Mar 2000) |
| bifurcated ligament | <anatomy> A strong V-shaped ligament on the dorsum of the foot that passes from the calcaneus distal to the tarsal sinus and attaches to cuboid and navicular bones; it is divided into the dorsal calcaneocuboid ligament and the calcaneonavicular ligament. Synonym: ligamentum bifurcatum, bifurcated ligament. (05 Mar 2000) |
| bifurcatio | Synonym: bifurcation. (05 Mar 2000) |
| bifurcatio aortae | The division of the aorta into right and left common iliac arteries; it occurs at the level of the fourth and fifth lumbar vertebral body. Synonym: bifurcatio aortae. (05 Mar 2000) |
| bifurcatio tracheae | The division of the trachea into the right and left main bronchi; it occurs at the level of the fifth or sixth thoracic vertebral body and is marked internally by the presence of a carina or keel-like ridge between the diverging bronchi. Synonym: bifurcatio tracheae. (05 Mar 2000) |