n. Agent noun of tinker; one who tinkers with things.
n. A meddler.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. an unskilled person who tries to fix or mend
n. a person who enjoys fixing and experimenting with machines and their parts
Word Usage
"The tinkerer is personified in the therapist and the being who is the World is represented by George Orr (he in fact holds the power of creation in his hands, but is ironically in power of Haber himself)."