[ α :k ]
■ noun
1》 a curve forming part of the circumference of a circle or other figure.
↘a curving trajectory.
↘[as modifier ] Mathematics indicating the inverse of a trigonometrical function: ~ cosine.
2》 a luminous electrical discharge between two points.
■ verb ( ~s , ~ing 'α:kɪŋ , ~ed α:kt )
1》 move with a curving trajectory.
2》 [as noun ~ing ] the forming of an electric ~.
Origin
ME: via OFr. from L. ~us 'bow, curve'.