"Tetra" isn't completely unknown in English but perhaps the link is more obvious to Russian-speakers (the original author was Russian)? Is четыре/chetyre a cogn

"Tetra" isn't completely unknown in English but perhaps the link is more obvious to Russian-speakers (the original author was Russian)? Is четыре/chetyre a cognate of Greek-derived tetra? https://translate.google.com/?sl=en&tl=ru&text=four https://translate.google.com/?sl=en&tl=ru&text=four