Master

M'ASTER, noun [Latin magister, compounded of the root of magis, major, greater.]

1. A man who rules, governs or directs either men or business. A man who owns slaves is their master; he who has servants is their master; he who has apprentices is their master; he who has apprentices is their master as he has the government and direction of them. The man who superintends and directs any business, is master or master workman.

O thou my friend, my genius, come along,

Thou master of the poet and the song.