of or pertaining to muscle or the muscles: muscular strain.
dependent on or affected by the muscles: muscular strength.
having well-developed muscles; brawny.
vigorously and forcefully expressed, executed, performed, etc., as if by the use of a great deal of muscular power: a muscular response to terrorism.
broad and energetic, especially with the implication that subtlety and grace are lacking: a muscular style.
reflected in physical activity and work: a muscular religion.
Informal. having or showing power; powerful: a muscular vehicle.

1675–85; < Latin mūscul(us) muscle + -ar1

muscularity, noun
muscularly, adverb
intermuscular, adjective
intermuscularly, adverb
intermuscularity, noun
nonmuscular, adjective
nonmuscularly, adverb
postmuscular, adjective
submuscular, adjective
submuscularly, adverb
unmuscular, adjective
unmuscularly, adverb

3. sinewy; strong, powerful; stalwart, sturdy. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
muscular (ˈmʌskjʊlə)
1.  having well-developed muscles; brawny
2.  of, relating to, or consisting of muscle
[C17: from New Latin muscularis, from musculusmuscle]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1680s, "pertaining to muscles," from Mod.L. musculus (see muscle). Meaning "having well-developed muscles" is from 1736. Muscular Christianity (1857) is originally in ref. to philosophy of Anglican clergyman and novelist Charles Kingsley (1819-1875).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

muscular mus·cu·lar (mŭs'kyə-lər)

  1. Of, relating to, or consisting of muscle.

  2. Having or characterized by well-developed muscles.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
muscle   (mŭs'əl)  Pronunciation Key 
A body tissue composed of sheets or bundles of cells that contract to produce movement or increase tension. Muscle cells contain filaments made of the proteins actin and myosin, which lie parallel to each other. When a muscle is signaled to contract, the actin and myosin filaments slide past each other in an overlapping pattern. ◇ Skeletal muscle effects voluntary movement and is made up of bundles of elongated cells (muscle fibers), each of which contains many nuclei. ◇ Smooth muscle provides the contractile force for the internal organs and is controlled by the autonomic nervous system. smooth muscle cells are spindle-shaped and each contains a single nucleus. ◇ Cardiac muscle makes up the muscle of the heart and consists of a meshwork of striated cells.

muscular adjective
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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