molecule

Meanings

1. 1
   noun

   the simplest structural unit of an element or compound in chemistry or physics

   An oxygen molecule is made up of two oxygen atoms, joined by a double bond.

2. 2
   noun

   The smallest particle of a specific element or compound that retains the chemical properties of that element or compound; two or more atoms held together by chemical bonds.

   Hydrogen chloride is a diatomic molecule, consisting of a hydrogen atom and a chlorine atom.

3. 3
   noun

   (nontechnical usage) a tiny piece of anything

4. 4
   noun

   A tiny amount.

Etymology

Borrowed from French molécule, from New Latin molecula (“a molecule”), diminutive of Latin moles (“a mass”).