Definify.com
Webster 1913 Edition
Functional
Func′tion-al
(fŭṉk′shŭn-al)
, Adj.
1.
Pertaining to, or connected with, a function or duty; official.
2.
(Pathology, Physiol.)
Pertaining to the function of an organ or part, or to the functions in general; involving or affecting function rather than physiology;
as,
. See functional
deafness; a functional
diseasefunctional disease
, below. [wns=2]
Functional disease
(Med.)
, a disease of which the symptoms cannot be referred to any appreciable lesion or change of structure; the derangement of an organ arising from a cause, often unknown, external to itself opposed to
organic disease
, in which the organ itself is affected.