monad

Noun
  1. (chemistry) an atom having a valence of one (synset 114645258)
    referred to in: chemical science, chemistry - the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions
    is a type of: atom - (physics and chemistry) the smallest component of an element having the chemical properties of the element
  2. A singular metaphysical entity from which material properties are said to derive (synset 113764980)
    is a type of: 1, ace, i, one, single, unity - the smallest whole number or a numeral representing this number
    same as: monas
  3. (biology) a single-celled microorganism (especially a flagellate protozoan) (synset 101329392)
    referred to in: biological science, biology - the science that studies living organisms
    is a type of: micro-organism, microorganism - any organism of microscopic size

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