Sentence:  Another is the <WSD>paleologism</WSD> of "pars pro toto" in which a part of an organ or function can symbolize the whole organ or concept; eg, the stomach may be the locus of difficulty with a patient with a history of frustrated dependency needs because of its association with the process of being fed and loved by the mother. 
Meaning of the word marked with <WSD> tags:  A word or phrase that was coined in the distant past, often now obscured, or if recently used: possibly having a definition or implication different from that of any earlier usage.