• The branch of biology that deals with animals and animal life, including the study of the structure, physiology, development, and classification of animals.
  • The animal life of a particular area or period.
  • The characteristics of a particular animal group or category.
  • A book or scholarly work on zoology.
  • that part of <xref>biology</xref> which relates to the <xref>animal</xref> kingdom, including the structure, <xref>embryology</xref>, <xref>evolution</xref>, <xref>classification</xref>, habits, and distribution of all animals, both living and <xref>extinct</xref>.
  • a treatise on this science.
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