1. (n.) The limb of the human body which extends from the shoulder to the hand; also, the corresponding limb of a monkey.

2. (n.) Anything resembling an arm

3. (n.) The fore limb of an animal, as of a bear.

4. (n.) A limb, or locomotive or prehensile organ, of an invertebrate animal.

5. (n.) A branch of a tree.

6. (n.) A slender part of an instrument or machine, projecting from a trunk, axis, or fulcrum; as, the arm of a steelyard.

7. (n.) The end of a yard; also, the part of an anchor which ends in the fluke.

8. (n.) An inlet of water from the sea.

9. (n.) A support for the elbow, at the side of a chair, the end of a sofa, etc.

10. (n.) Fig.: Power; might; strength; support; as, the secular arm; the arm of the law.

11. (n.) A branch of the military service; as, the cavalry arm was made efficient.

12. (n.) A weapon of offense or defense; an instrument of warfare; -- commonly in the pl.

13. (v. t.) To take by the arm; to take up in one's arms.

14. (v. t.) To furnish with arms or limbs.

15. (v. t.) To furnish or equip with weapons of offense or defense; as, to arm soldiers; to arm the country.

16. (v. t.) To cover or furnish with a plate, or with whatever will add strength, force, security, or efficiency; as, to arm the hit of a sword; to arm a hook in angling.

17. (v. t.) Fig.: To furnish with means of defense; to prepare for resistance; to fortify, in a moral sense.

18. (v. i.) To provide one's self with arms, weapons, or means of attack or resistance; to take arms.

accouter advocate affiliate alpenstock appendage appoint armlet armor armor-plate athletic supporter authorize back backbone backing bandeau bank barricade battle bay bayou bearer beef belt biceps bight bless block blockade boca bough bra brace bracer bracket branch branch office brassiere bulwark buttress cane carrier castellate cervix champion chapter cloak clothe clothe with power compass about copyright corset cove cover creek crenellate crook crutch cushion defend deputize dig in division dress elbow ell embattle empower enable endow endue energy ensure entrench equip estuary euripus extension fence fend fit fit out fit up fjord force forearm fortify foundation garment frith fulcrum furnish garrison gear girdle guarantee guard gulf gut guy guywire hand harbor haven heel imp inlet insure invest jock jockstrap joint keep keep from harm kyle leg limb link lobe lobule local loch lodge mainstay maintainer make safe man man the garrison mast member mine mouth munition muscle narrow narrow seas narrows natural harbor neck nestle offshoot organ outfit palisade patent pinion police post prepare prop protect put in shape ramification reach ready register reinforce reinforcement reinforcer rest resting place ride shotgun for rig rig out rig up rigging road roads roadstead runner safeguard scion screen secure service shelter shield shoulder shroud sinew slough sound spine spray sprig sprit spur staff standing rigging stave stay steam stick stiffener strait straits strength strengthener strong arm support supporter sustainer switch tail tendril turn out twig underwrite upholder upper arm vigor walking stick wall wing wrist