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.
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.
I will never use a substitute for butter. Margarine is one molecule away from eating plastic. If I'm going to eat that type of food, it's going to be the real deal. Paula Deen
I love making stuff. There's a joy in having the first molecule of an idea, then testing it in front of audiences at secret shows that people only know about the day before. I videotape those, study them, enjoy being in the character and figuring out the movie. Mike Myers
Climate change is a global issue - from the point of view of the Earth's climate, a molecule of CO2 emitted in Bejing is the same as a molecule emitted in Sydney. Jeff Goodell
The magnitude of the atomic weight determines the character of the element, just as the magnitude of the molecule determines the character of a compound body. Dmitri Mendeleev
I tell my students to try to know molecules, so well that when they have some question involving molecules, they can ask themselves, What would I do if I were that molecule? George Wald