Phrases starting with the letter: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Previous word: molecular weight
Next word: molehill
Definition of: molecule
Our photo definition of molecule 
(mol′ə·kyl) noun
1. Physics The smallest part of an element, substance, or compound that can exist freely in the solid, liquid, or gaseous state and still retain its composition and properties.
2. Any small particle. See synonyms under PARTICLE. [<F molécule <NL molecula, dim. of L moles mass]
Comment about this word, ask questions, or add new information about this topic: