vade mecum /ˌvādē ˈmēkəm, , ˌveɪdi ˈmikəm 
, vädē ˈmākəm, vɑdi ˈmeɪkəm / ▸ noun a handbook or guide that is kept constantly at hand for consultation: his book is an excellent vade mecum for writers.
– ORIGIN early 17th century: modern Latin, literally ‘go with me’.
EnglishOxford New American Dictionary
