[as-truh-nawt, -not] 
| a person engaged in or trained for spaceflight. |
| as·tro·naut (ās'trə-nôt') n. A person trained to pilot, navigate, or otherwise participate as a crew member of a spacecraft. [astro- + Greek nautēs, sailor (from naus, ship; see nāu- in Indo-European roots).] |
A crew member of a space mission launched by the United States. (See Apollo program and Mercury program.)
trəˌnɔt