Consultant
来自Big Physics
late 17th century (in the sense ‘a person who consults’): probably from French, from Latin consultare (see consult).
wiktionary
From French consultant, present participle of consulter, from Latin cōnsultāre(“to deliberate, consult”), frequentative of cōnsulere(“to consult, deliberate, consider, reflect upon, ask advice”), from com-(“together”) + -sulere, of uncertain origin.
etymonline
consultant (n.)
1690s, "person who consults an oracle," from consult + -ant. In medicine, "physician called in by the attending physician to give consultation in a case," by 1872 (perhaps from French, where it was in use by 1867); general meaning "one qualified to give professional advice" is first attested 1893 in a Sherlock Holmes story. Related: Consultancy (1955).
