from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A transparent dome on the top of an aircraft, through which celestial observations are made for navigation.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A transparent dome in the fuselage of an aircraft or spacecraft through which navigational observations may be made
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a transparent dome on top of an airplane where the navigator can make celestial observations
astro- + dome (Wiktionary)