" muscles "

[Noun]  | "mus*cle" | \ ˈmə-səl \

1: a body tissue consisting of long cells that contract when stimulated and produce motion

2: an organ that is essentially a mass of muscle tissue attached at either end to a fixed point and that by contracting moves or checks the movement of a body part

3: muscular strength : brawn

Origin: 14th century ;

 Middle English, from Latin musculus, from diminutive of mus mouse {mat|mouse:1|};

[Noun]  | "cardiac muscle" 

1: the principal involuntary-muscle tissue of the vertebrate heart made up of striated fibers joined at usually branched ends and functioning in synchronized rhythmic contraction

Origin: 1846 ;

[Noun]  | "ex*tra*oc*u*lar muscle" | \ ˌek-strə-ˈä-kyə-lər- \

1: any of the six small voluntary muscles that pass between the eyeball and the orbit and control the movement and stabilization of the eyeball in relation to the orbit

Origin: 1939 ;

[Noun]  | "involuntary muscle" 

1: muscle governing reflex functions and not under direct voluntary control; especially : smooth muscle

Origin: 1840 ;

[Noun]  | "pectoral muscle" 

1: any of the muscles which connect the ventral walls of the chest with the bones of the upper arm and shoulder and of which there are two on each side of the human body

Origin: 1615 ;

[Noun]  | "skeletal muscle" 

1: striated muscle that is usually attached to the skeleton and is usually under voluntary control

Origin: 1877 ;

[Noun]  | "smooth muscle" 

1: muscle tissue that lacks cross striations, is made up of elongated spindle-shaped cells having a central nucleus, and is found especially in vertebrate hollow organs and structures (such as the digestive tract and bladder) as thin sheets performing functions not subject to direct voluntary control and in all or most of the musculature of invertebrates other than arthropods

Origin: circa 1890 ;

[Noun]  | "ster*no*clei*do*mas*toid" | \ ˌstər-nə-ˌklī-də-ˈma-ˌstȯid \

1: a thick superficial muscle on each side of the neck that arises by one head from the first segment of the sternum and by a second from the inner part of the clavicle, that inserts into the mastoid process and occipital bone, and that acts especially to bend, rotate, flex, and extend the head —called also sternomastoid

Origin: 1831 ;

 New Latin sternocleidomastoides, from stern- + cleid- + mastoides mastoid;

[Verb]  | "muscle" 

1: to move or force by or as if by muscular effort

2: to make one's way by brute strength or by force

Origin: circa 1819 ;

[Verb]  | "flex" | \ ˈfleks \

1: to bend especially repeatedly

2: to move muscles so as to cause flexion of (a joint)

3: to move or tense (a muscle) by contraction

Origin: circa 1521 ;

 Borrowed from Latin flexus, past participle of flectere "to cause to go in a different direction, bend, curve," of uncertain origin;

[Verb]  | "muscles" 

[Verb]  | "muscle" 

[Noun]  | "muscle"