From The Collaborative International Dictionary of English v.0.48 :
Apprentice \Ap*pren"tice\, v. t. [imp. & p. p. Apprenticed; p.
pr. & vb. n. Apprenticing.]
To bind to, or put under the care of, a master, for the
purpose of instruction in a trade or business.
[1913 Webster]
From WordNet (r) 3.0 (2006) :
apprenticed
adj 1: bound by contract [syn: apprenticed, articled,
bound, indentured]