antiparallel

[ an-tee-par-uh-lel, an-tahy- ]
/ ˌæn tiˈpær əˌlɛl, ˌæn taɪ- /

adjective Mathematics, Physics.

(of two vectors) pointing in opposite directions.

Origin of antiparallel

First recorded in 1650–60; anti- + parallel

British Dictionary definitions for antiparallel

antiparallel
/ (ˌæntɪˈpærəˌlɛl) /

adjective

physics parallel but pointing in the opposite direction
maths (of vectors) parallel but having opposite directions