"Molecule" is a word in ENGLISH

A group of atoms so united and combined by chemical
affinity that they form a complete, integrated whole, being the
smallest portion of any particular compound that can exist in a free
state; as, a molecule of water consists of two atoms of hydrogen and
one of oxygen. Cf. Atom.

One of the very small invisible particles of which all
matter is supposed to consist.

The smallest part of any substance which possesses the
characteristic properties and qualities of that substance, and which
can exist alone in a free state.