Английский Этимологический словарь - manual (adj.)

- 1406, from L. manualis "of or belonging to the hand," from manus "hand," from PIE *men-. The noun is from 15c. and originally meant "service book used by a priest," from O.Fr. manuel, from L.L. manuale "case or cover of a book, handbook," neut. of L. manualis.