pseudovector [¦sü·dō`vek·tǝr] PHYSICS 1. A quantity which transforms as a vector under space rotations but which transforms as a vector, together with a change in sign, under a space inversion. Also known as axial vector. 2. A quantity which transforms as a four-vector under Lorentz transformations, but with an additional sign change under space reflection or time reflection or both. |