atom
nouns
(physics and chemistry) the smallest component of an element having the chemical properties of the element
is a part of
any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter
is a part of
(physics and chemistry) the simplest structural unit of an element or compound
domain category
the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions
domain category
the science of matter and energy and their interactions
"his favorite subject was physics"
is a type of (narrower)
the real physical matter of which a person or thing consists
"DNA is the substance of our genes"
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