imaginary

a. [ L. imaginarius: cf. F. imaginaire. ] Existing only in imagination or fancy; not real; fancied; visionary; ideal. [ 1913 Webster ]

Wilt thou add to all the griefs I suffer
Imaginary ills and fancied tortures? Addison. [ 1913 Webster ]

Imaginary calculus See under Calculus. --
Imaginary expression or
Imaginary quantity (Alg.), an algebraic expression which involves the impossible operation of taking the square root of a negative quantity; as, √-9, a + b √-1. --
Imaginary points,
lines,
surfaces, etc. (Geom.), points, lines, surfaces, etc., imagined to exist, although by reason of certain changes of a figure they have in fact ceased to have a real existence.

Syn. -- Ideal; fanciful; chimerical; visionary; fancied; unreal; illusive. [ 1913 Webster ]