1 Higher doses can cause impairment of memory, judgment and coordination, irritability, paranoia,3 and suicidal thoughts. Some people experience the opposite of the intended effect, such as agitation or aggression.
Adj. 1. vertical-at right angles to the plane of the horizon or a base line; a vertical camera angle; the monument consists of two vertical pillars supporting a horizontal slab; measure the perpendicular height. perpendicular.
Definition of parallel. 1  1a : a parallel line, curve, or surfaceb : one of the imaginary circles on the surface of the earth paralleling the equator and marking the latitude; also : the corresponding line on a globe or map â see latitude illustrationc : a character â¥ used in printing especially as a reference mark.