Merriam-Webster's Collegiate® Dictionary, 11th Edition
LEG
I. noun
Etymology: Middle English, from Old Norse leggr
Date: 14th century
a limb of an animal used especially for supporting the body and for walking: as, a. one of the paired vertebrate limbs that in bipeds extend from the top of the thigh to the foot, the part of such a limb between the knee and foot, the back half of a hindquarter of a meat animal, one of the rather generalized segmental appendages of an arthropod used in walking and crawling,
2. a pole or bar serving as a support or prop , a branch of a forked or jointed object ,
3. the part of an article of clothing that covers the leg, the part of the upper (as of a boot) that extends above the ankle, obeisance , bow , a side of a right triangle that is not the hypotenuse,
6. the course and distance sailed by a boat on a single tack, a portion of a trip ; stage , one section of a relay race, one of several events or games necessary to be won to decide a competition , a branch or part of an object or system, long-term appeal or interest , legless adjective
II. intransitive verb (legged; legging)
Date: 1601
to use the legs in walking,
III. abbreviation legal, legato, legislative; legislature