vadémécumcommon nounSyllable DecompositionvadémécumEtymologyexpandfrom Latin vade mecum (« come with me ») by linking the two words and adopting French accents.Definition1. Travel guide, small book that one can conveniently carry, to get information, to find one's way.expandCe petit livre est mon vadémécum.PluralvadémécumsSee alsovade-mecum (cn.)