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From Biology-Online Dictionary | Biology-Online Dictionary
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Existing only in imagination or fancy; not real; fancied; visionary; ideal. Wilt thou add to all the griefs i suffer imaginary ills and fancied tortures? (Addison)

(Science: mathematics) imaginary expression or quantity, 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.

Synonym: ideal, fanciful, chimerical, visionary, fancied, unreal, illusive.

Origin: L. Imaginarius: cf. F. Imaginaire.