@najmelliw,
The right to keep and bear arms is contingent upon the stated need for a well-regulated militia. The question of what constitues a well-regulated militia can be referred back to Article One, Section Eight of the constitution, one of the paragraphs of which reads, in its entirety:
[Congress shall have the power] To provide for organizing, arming, and disciplining, the Militia, and for governing such Part of them as may be employed in the Service of the United States, reserving to the States respectively, the Appointment of the Officers, and the Authority of training the Militia according to the discipline prescribed by Congress;
In
Presser v. Illinois (1886), the Supremes held that:
state legislatures may enact statutes to control and regulate all organizations, drilling, and parading of military bodies and associations except those which are authorized by the militia laws of the United States. Although the gun loonies claim otherwise, this had never been overturned nor amended--so only the states have the right to form such military bodies, within the restrictions of the various militia acts which have been passed by Congress.
In
The United States v. Miller (1939), the Supremes upheld the 1934 National Firearms Act. This was on several bases, including the taxation powers of the Congress, as well as the regulation of interstate commerce. However, referring to the well-regulated militia, the majority opinion wrote:
In the absence of any evidence tending to show that possession or use of a "shotgun having a barrel of less than eighteen inches in length" at this time has some reasonable relationship to the preservation or efficiency of a well regulated militia, we cannot say that the Second Amendment guarantees the right to keep and bear such an instrument.
So whatever the gun loonies may say, individuals do not determine what weapons they may possess, Congress does. The Militia Act of 1903 recognized the organized militia--what became known as the National Guard--and the unorganized militia, which is everybody else. Congress can determine that private individuals may not possess nerve gas, hand grenades, machine guns and tactical nukes. Therefore, in answer to your question--no, that laundry list of instruments of mayhem cannot be considered within the right to keep and bear arms, and the dictionary be damned.