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Use "highth" in a sentence
"If I am writing about width and variant, I don't think I'd ever write "highth" -- it's just not proper."
"But, "highth" is all through Milton's Paradise Lost, and stuck around the vernacular because of its association to other measuring-related words ending in "th", e.g. width, breadth, length."
"More often than not, if I am talking about the width and insert variant here of something, I say "highth" and then feel stupid, but it's one of those words that you can't do a darn thing about, because you grew up with it."