Any inflammable substance.
Incapable of burning; not easily set on fire.
Capable of burning; easily set on fire.
Easily excited; set off by the slightest excuse; easily enraged or inflamed.
Used other than figuratively or idiomatically: the edge of a knife.
A piece of steel sharpened to an acute edge or angle, and resting on a smooth surface, serving as the axis of motion of a pendulum, scale beam, or other piece required to oscillate with the least possible friction.
A precarious balance that could be upset by a very small force in either direction.