(mathematics) A straight line (or the length of such line) connecting any point, as of a curve, with a fixed point, or pole, round which the straight line turns, and to which it serves to refer the successive points of a curve, in a system of polar coordinates.

(transport, space science) An expendable unmanned resupply spacecraft developed by the European Space Agency.

plural of vector sum

(embryology) The hemisphere of the blastula opposite to the animal pole comprising large yolk cells dividing at a slower rate that eventually differentiate into the extraembryonic membranes.

(UK) railroad car

(UK) railroad car

(anatomy) The portal vein.

plural of veal crate

A thick mohair or cotton plush used for upholstering.

(of a disease or disease agent) Transmitted by a vector, such as mosquitos.