Sikorsky
biographical name
Si·kor·sky sə-ˈkȯr-skē 
Igor Ivan 1889–1972 American (Russian-born) aeronautical engineer
- proto-Hittite
- Proto-Indo-European
- proto-Malay
- proto-malayan
- Proto-Romance
- Proto-Semitic
- proto-Sinaitic
- Proto-Teutonic
- protoactinium
- protoactiniums
- protoanthropologies
- protoanthropologyes
- protoanthropologys
- protoarchaeologies
- protoarchaeology
- protoarchaeologyes
- protoarchaeologys
- protoarcheologies
- protoarcheologyes
- protoarcheologys
- Protoascales
- Protoascomycetae
- Protoascomycetes
- protoaves
- protoavises