Meaning of the word "butterglance" to describe a woman's way of looking at someone?

Question

I found this word in a rhyme inscribed on the fly leaf of a book of American poetry and dated 1878. You can see the poem listed in [Edith Wharton's Library: a catalogue](https://books.google.com/books?id=ax8gAQAAIAAJ&q=butterglance&dq=butterglance&hl=en&sa=X&ved=0ahUKEwj8manYuLbPAhXD7YMKHYU0APUQ6AEIIjAB), which was written by George Ransden and published by Stone Through in 1999:>pc One poem marked in the Contents list and that one and another in the text, possibly by the writer of the rhyme on the flyleaf: >> In this book dear girl/ Find a truthful utterance />> For the thoughts that whirl / Oft expressed in butterglance">>[Signed] WBB³<br />I can't find anything in the O.E.D., and [Google Books](https://www.google.com/search?tbm=bks&hl=en&q=butterglance) does not reveal too much either, aside from the aforementioned source and a couple of potential mentions which can't be previewed. You can also find [what looks like an original handwritten version of the poem](http://sheilaliming.com/ewl/items/show/17) which can be seen on the Edith Wharton's library website, hosted by [Sheila Liming](http://sheilaliming.com/), Assistant Professor of English in the University of North Dakota. It is handwritten on a copy of The Poems of Thomas Bailey Aldrich, published by Boston Ticknor and Fields in 1865. Above it is inscribed "Edith Jones - Oct. 11th 1878", which may be an indicator of who owned that copy of the book, and when she first got it.

Answer 1

I do believe this is a made up word for poetic effect. In the previous line the word "utterance" is used, and in the second we see one word "butterglance". Each word is three syllables and have rhyme; however, I feel the word is a squash up of "but her glance" to show that so much can be said from this girl in just a look. I can not be certain, but it seems to be the case. By doing this the writer is able to keep the rhyme scheme, the intended beat, and keep the meaning in context.