A fellow member of a crew, especially of a crew of astronauts. (noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "crewmate" in a sentence
"Shuttle crewmembers grow close to each other's families, said Kelly's crewmate Greg Johnson."
"Blood flowed, and the first man struck back, cracking his crewmate on the temple."
"Earlier Tuesday, Coleman's station crewmate astronaut Ron Garan noted that Gagarin's flight and the first shuttle launch were byproducts of a space race between two superpowers, the United States and the Soviet Union."