All 4 Uses

molecule
in
The Curious Incident of the Dog in the Night-time
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And all his molecules were broken down into other molecules and they went into the earth and were eaten by worms and went into the plants and if we go and dig in the same place in 10 years there will be nothing except his skeleton left.†
Chpt 60

molecules = chemical substance comprised of the smallest amount of a chemical substance that can exist by itself
And all his molecules were broken down into other molecules and they went into the earth and were eaten by worms and went into the plants and if we go and dig in the same place in 10 years there will be nothing except his skeleton left.†
Chpt 60
But the smoke goes out of the chimney and into the air and sometimes I look up into the sky and I think that there are molecules ofMother up there, or in clouds over Africa or the Antarctic, or coming down as rain in the rain forests in Brazil, or in snow somewhere.†
Chpt 60
And stars are the places where the molecules that life is made of were constructed billions of years ago.†
Chpt 83 *

Definitions:

(1) (molecule)
the smallest amount of a chemical substance that can exist by itself -- usually consisting of 2 or more atoms
(2) (meaning too rare to warrant focus)
Less commonly, molecule is used informally to refer to anything that is very small.