MEANING: adjective: Lasting a very short time; transitory.
noun: Anything short-lived.

ETYMOLOGY: From Greek ephemeros (short-lived), from epi- (upon) + hemera (day). Earliest documented use: 1576.

PHEMERAL - pertaining to the upper-leg bone

e-pH EMERALD - a highly acidic green jewel, with a log-hydrogen-ion concentration of -2.718281828...

EPHEMERAW - I know it hurts now, but it'll be better by tomorrow