Metaphor

A metaphor is figure of speech that draws an equivalence between two unrelated items. Unlike a simile, it does not use "like" or "as", and uses equivalence rather than a similarity.
House often uses metaphor to explain a concept in physiology or etiology to his fellows or, in less common cases, to his patients or supervisors. In the series, they serve the purpose of explaining very complicated concepts of medicine to the audience in plain language.However, House's use of metaphor is not limited to medical matters. He often uses them to explain philosophical concepts as well.
Metaphor at Wikipedia
House and his metaphors at About.com
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