The Collaborative International Dictionary of English v.0.48:
Muscular \Mus"cu*lar\, a. [Cf. F. musculaire. See Muscle.]
1. Of or pertaining to a muscle, or to a system of muscles;
consisting of, or constituting, a muscle or muscles; as,
Great muscular strength, accompanied by much
2. Performed by, or dependent on, a muscle or the muscles.
"The muscular motion." --Arbuthnot.
3. Well furnished with muscles; having well-developed
muscles; brawny; hence, strong; powerful; vigorous; as, a
muscular body or arm.
Muscular Christian, one who believes in a part of religious
duty to maintain a healthful and vigorous physical state.
(a) The practice and opinion of those Christians who
believe that it is a part of religious duty to
maintain a vigorous condition of the body, and who
therefore approve of athletic sports and exercises as
conductive to good health, good morals, and right
feelings in religious matters. --T. Hughes.
(b) An active, robust, and cheerful Christian life, as
opposed to a meditative and gloomy one. --C. Kingsley.
Muscular excitability (Physiol.), that property in virtue
of which a muscle shortens, when it is stimulated;
Muscular sense (Physiol.), muscular sensibility; the sense
by which we obtain knowledge of the condition of our
muscles and to what extent they are contracted, also of
the position of the various parts of our bodies and the
resistance offering by external objects.