From The Collaborative International Dictionary of English v.0.48:

natural family \nat"u*ral fam"i*ly\, n. (Biol.)
   a group of living organisms classed as a family in a
   toxonomic classification.

From The Collaborative International Dictionary of English v.0.48:

Family \Fam"i*ly\, n.; pl. Families. [L. familia, fr. famulus
   servant; akin to Oscan famel servant, cf. faamat he dwells,
   Skr. dh[=a]man house, fr. dh[=a]to set, make, do: cf. F.
   famille. Cf. Do, v. t., Doom, Fact, Feat.]
   1. The collective body of persons who live in one house, and
      under one head or manager; a household, including parents,
      children, and servants, and, as the case may be, lodgers
      or boarders.
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   2. The group comprising a husband and wife and their
      dependent children, constituting a fundamental unit in the
      organization of society.
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            The welfare of the family underlies the welfare of
            society.                              --H. Spencer.
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   3. Those who descend from one common progenitor; a tribe,
      clan, or race; kindred; house; as, the human family; the
      family of Abraham; the father of a family.
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            Go ! and pretend your family is young. --Pope.
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   4. Course of descent; genealogy; line of ancestors; lineage.
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   5. Honorable descent; noble or respectable stock; as, a man
      of family.
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   6. A group of kindred or closely related individuals; as, a
      family of languages; a family of States; the chlorine
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   7. (Biol.) A group of organisms, either animal or vegetable,
      related by certain points of resemblance in structure or
      development, more comprehensive than a genus, because it
      is usually based on fewer or less pronounced points of
      likeness. In Zoology a family is less comprehesive than an
      order; in botany it is often considered the same thing as
      an order.
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   Family circle. See under Circle.

   Family man.
      (a) A man who has a family; esp., one who has a wife and
          children living with him and dependent upon him.
      (b) A man of domestic habits. "The Jews are generally,
          when married, most exemplary family men." --Mayhew.

   Family of curves or Family of surfaces (Geom.), a group
      of curves or surfaces derived from a single equation.

   In a family way, like one belonging to the family. "Why
      don't we ask him and his ladies to come over in a family
      way, and dine with some other plain country gentlefolks?"

   In the family way, pregnant. [Colloq. euphemism]
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