Where does “monoval” come from?

monoval (English) comes from English Oval, from Late Latin ovalis, from Latin ōvum, from Latin -ātus, from Proto-Italic -ātos, from Proto-Indo-European -éh₂tos — Forms adjectives from nouns, indicating the possession of a thing or a quality.

Ancestry of “monoval”, step by step

monoval traces back through two separate lines of ancestry.

via English Oval

Step	Language	Word	Meaning
1	English	Oval	A cricket ground in South London
2	Late Latin	ovalis	Of or pertaining to an ovation
3	Latin	ōvum	egg
4	Latin	-ātus	ed
5	Proto-Italic	-ātos	—
6	Proto-Indo-European	-éh₂tos	Forms adjectives from nouns, indicating the possession of a thing or a quality

via English mono

Step	Language	Word	Meaning
1	English	mono	Clipping of mononucleosis; A bicycle or...
2	English	mono-	API; one, single, only
3	Ancient Greek	μονο-	one; mono-

Every word from Proto-Indo-European -éh₂tos →Every word from Latin -ātus →Every word from Latin ōvum →