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 molecule molecule /ˈmɑːləˌkjuːl/

noun

  1. () (physics and chemistry) the simplest structural unit of an element or compound  ( molecule )
    (physics and chemistry) the simplest structural unit of an element or compound
      A water molecule consists of two hydrogen atoms bonded to an oxygen atom.
    A water molecule consists of two hydrogen atoms bonded to an oxygen atom.
  2. (nontechnical usage) a tiny piece of anything  ( atom , corpuscle , molecule , mote , particle , speck )
    (nontechnical usage) a tiny piece of anything
      The scientist observed the movement of particles under a microscope.
    The scientist observed the movement of particles under a microscope.