secant
Concise Oxford English Dictionary © 2008 Oxford University Press:
secant /ˈsiːk(ə)nt, ˈsɛk-/
▶noun
- 1 Mathematics the ratio of the hypotenuse (in a right-angled triangle) to the shorter side adjacent to an acute angle.
- 2 Geometry a straight line that cuts a curve in two or more parts.
– origin C16; from Fr. sécante, based on L. secare ‘to cut’.
'secant' also found in these Oxford entries:

