Where does “stereoviewer” come from?

stereoviewer (English) comes from English viewer, from Middle English vewer, from Middle English -er, from Old French -er, from Latin -āre, from Proto-Italic -āō, from Proto-Indo-European -eh₂yéti, from Proto-Indo-European -yéti — he, she.

Ancestry of “stereoviewer”, step by step

stereoviewer traces back through two separate lines of ancestry.

via English viewer

StepLanguageWordMeaning
1EnglishviewerSomeone who views a spectacle; an onlooker or...
2Middle EnglishvewerA recorder or examiner, especially a legally...
3Middle English-eragentive suffix; agent noun suffix
4Old French-erAlternative form of -ier, verbal suffix;...
5Latin-ārefirst conjugation
6Proto-Italic-āōForms primarily denominative verbs
7Proto-Indo-European-eh₂yétiCreates iterative/ frequentative/ intensive...
8Proto-Indo-European-yétiCreates intransitive, often deponent,...
9Proto-Indo-Europeanyé-
10Chichewaiyehe, she

via English stereo

StepLanguageWordMeaning
1EnglishstereoA system of recording or reproducing sound that...
2EnglishstereotypeA conventional, formulaic, and often...
3FrenchstéréotypeA stereotype, as in conventional, formulaic, and...
4Frenchtypetype; sort, kind; guy, bloke, man; typeface
5Latintypusfigure, image; type, form, sort, kind; form,...
6Ancient GreekτύποςA blow, pressing; The results of a blow: mark,...
7Ancient Greekτύπτωto beat, strike, smite; to beat, strike oneself
8Proto-Indo-European(s)tewp-to push, to stick
9Proto-Indo-European(s)tew-to push, to hit
Every word from Chichewa iyeEvery word from Proto-Indo-European -yétiEvery word from Old French -er