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> I've sometimes heard "orphan" used to represent a single word left alone on its own line at the end of a paragraph, but the terms are often confused and Carter could have used "widow" in that sense.

This is an acceptable use of the term "widow". From the Oxford English Dictionary [0]:

> A short line of text (usually one consisting of one word or part of a word) which falls undesirably at the end of a paragraph, esp. one set at the top of a page or column.

But there are dozens of contradictory meanings for "widow" and "orphan" [1], so the definition that you gave isn't wrong either.

[0]: https://doi.org/10.1093/OED/1579263894

[1]: https://tug.org/TUGboat/tb43-1/tb133chernoff-widows.pdf#subs... (Disclaimer: I'm the author of this article)

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Widows are when the final line of a paragraph starts the next page. Orphans are when the first line of a paragraph ends a page.
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Funny because "fixing an orphan" is hard in real life (assuming they've lost both their parents, you have to find them a foster home) but easy in typesetting (just add an empty line before), whereas "fixing a widow" is easy in real life (just remarry) but hard in typesetting.
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