D defs.my
Entry 1 sense Webster, 1913

Vade mecum

· Va·de me·cum · IPA /ˌveɪdi ˈmiːkəm/
01 A book or other thing that a person carries with him as a constant companion; a manual; a handbook.
  1. 1.
    A book or other thing that a person carries with him as a constant companion; a manual; a handbook.