Sentence:  The doctor here, I will proceed with the learned. / When he discourseth of dissection, / Or of any point of anatomy; that he tells you / Of vena cava and of vena porta, / The meseraicks, and the mesenterium: / What does he else but <WSD>cant</WSD>? 
Meaning of the word marked with <WSD> tags:  To speak with the jargon of a class or subgroup.