Si·kor·sky (s?-kôr?sk?), Igor Ivan 1889-1972. Russian-born American aviation pioneer. He designed (1939) the first successful American helicopter.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.Sikorsky (s??k??sk?) n (Biography) Igor. 1889?1972, US aeronautical engineer, born in Russia. He designed and flew the first four-engined aircraft (1913) and designed the first successful helicopter (1939)Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014Si?kor?sky (s??k?r ski) n. Igor, 1889?1972, U.S. aeronautical engineer, born in Russia. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.