Three great scientific theories of the structure of the universe are
the molecular, the corpuscular and the atomic. A fourth affirms, with
Haeckel, the condensation or precipitation of matter from ether --
whose existence is proved by the condensation or precipitation ... A
fifth theory is held by idiots, but it is doubtful if they know any
more about the matter than the others.
-- Ambrose Bierce, "The Devil's Dictionary"
MOLECULE, n. The ultimate, indivisible unit of matter. It is
distinguished from the corpuscle, also the ultimate, indivisible unit
of matter, by a closer resemblance to the atom, also the ultimate,
indivisible unit of matter....