"a practitioner; one who practices (as distinguished from one who theorizes," originally also practitian, c. 1500, from Old French practicien (Modern French praticien), from Late Latin practicus "fit for action," (see practice (v.)). An earlier word was practisour (late 14c.).
practical
practicality
practically
practice
practiced
practician
practicing
practicum
practise
practitioner
Prado