Rhyme-tag

rhyme-tag, a word or phrase used primarily to produce a rhyme. Rhyme-tags are used to comic effect in much light verse, as in W.S. Gilbert’s “The Modern Major-Gineral,” which reads in part

I am the very pattern of a modern Major-Gineral,
I’ve information vegetable, animal, and mineral;
I know the kings of England, and I quote the fights historical,
From Marathon to Waterloo, in order categorical;
I’m very well acquainted, too, with matters mathematical,
I understand equations, both the simple and quadratical;
About binomial theorem I’m teeming with a lot o’ news,
With interesting facts about the square of the hypotenuse.
I’m very good at integral and differential calculus,
I know the scientific names of beings animalculous.
In short, in matters vegetable, animal, and mineral,
I am the very model of a modern Major-Gineral.