encyclopedias

/IH0 N S AY0 K L AH0 P IY1 D IY0 AH0 Z/
noun
  1. 1

    A comprehensive reference work (often spanning several printed volumes) with articles (usually arranged in alphabetical order, or sometimes arranged by category) on a range of subjects, sometimes general, sometimes limited to a particular field.

    His life's work was a four-volume encyclopedia of aviation topics.

  2. 2

    The circle of arts and sciences; a comprehensive summary of knowledge, or of a branch of knowledge.

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Source: https://en.wiktionary.org/wiki/encyclopedia, https://en.wiktionary.org/wiki/encyclopedias