Where does “unequivalved” come from?

unequivalved (English) comes from English equivalved, from English valved, from English valve, from Latin valva, from Proto-Italic *wolVwā-, from Proto-Indo-European *wol-ew-o-.

Ancestry of “unequivalved”, step by step

unequivalved traces back through two separate lines of ancestry.

via English equivalved

StepLanguageWordMeaning
1EnglishequivalvedSynonym of equivalve
2EnglishvalvedHaving valves; simple past tense and past...
3EnglishvalveA device that controls the flow of a gas or fluid...
4Latinvalvadouble or folding door; one leaf of such doors
5Proto-Italic*wolVwā-
6Proto-Indo-European*wol-ew-o-

via English un

StepLanguageWordMeaning
1EnglishunOne
Every word from Proto-Indo-European *wol-ew-o-Every word from Proto-Italic *wolVwā-Every word from Latin valva