happicle n (happy + diminutive suffix Ðicle, like in "particle," "icicle") Ð a particle of happiness, the smallest unit of happiness; a single happy occurrence or a momentary feeling of happiness.
There is no happiness in this world, but there are happicles. Sometimes we can catch them, fleeting and unpredictable as they are.
Like photons, happicles have zero mass at rest--the inertial mass that we identify with happiness. Happicles just flash and go out in passing. They may be as transitory as a fragrance in the air, or a yellow falling leaf, or a glance of a passerby on the street.
Happicles make life worth of living, even in the absence of stable happiness.