Sentence:  With the medical renaissance of the eighteenth and nineteenth centuries, observations on the state of the tongue and the mouth became as important as the taking of the pulse. Indeed, by 1844, <WSD>glossology</WSD> had become so important a part of the medical art that a Dr. Benjamin Ridge proposed the fantastic theory that the viscera were represented by definite areas on the tongue and that an abnormality in a viscus was reflected in this predetermined area. 
Meaning of the word marked with <WSD> tags:  The diagnosis of disease by examination of the tongue.