Category: B

A lens that has a convex surface on each side.  

A lens that has a concave surface on each side.  

The distance from the basion of the foramen magnum of the skull to the center of the suture between the frontal and nasal bones.  

An uncorrected posterior displacement of the knee bones, followed by ankylosis at the joint.  

In electrocardiography, any lead that consists of one electrode at one body site and another at a different site. A standard limb lead, I, II, or III, is a bipolar lead.  

The outermost layer of the uterine endometrium lying next to the myometrium.  

The rod and cone layer of the retina of the eye.  

Ontogeny recapitulates phylogeny (i.e., an individual in its development recapitulates stages in its evolutionary development).  

Lard containing 1% benzoin, used as a vehicle for certain types of topically applied medicines.  

A structure or spot on a bone used as a reference for measurement.