noun: The addition of a letter or syllable at the end of a word, either through natural development or to add emphasis. For example, height-th for height.
ETYMOLOGY:
Via Latin, from Greek paragoge, from para- (beyond) + -agogue (leader).
USAGE:
"Henry Peacham cites the expansion of 'vile' to 'vilde' as an example of the rhetorical figure paragoge."
Stephen Booth; Shakespeare's Sonnets; Yale University Press; 2000.

I really don't understand today's one at all. Vilde is a proper name, what is rhetorical about that? And what is height-th? Does the addition of the th heigthen the emphasis? (!_!)