Aider

//ˈeɪdə// noun

Definitions

Noun
  1. 1
    A person who aids or assists.

    "The capitaines of the toune seyng theire pillers borken, and their chief ayders discomfited, rendered the toune to the duke of Somerset,"

  2. 2
    A mountaineer's stirrup or étrier.

    "As I was switching my feet in my aiders, the hook popped."

Etymology

From aid + -er.

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