from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An opening or mouth, as of a river or stream.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The outward opening of a river, valley, or strait.
from the GNU version of the Collaborative International Dictionary of English
- n. The outward opening of a river, of a valley, or of a strait.
from The Century Dictionary and Cyclopedia
- n. A mouth, opening out, or outlet; specifically, the opening out of a stream as it emerges from a confined valley or gorge upon an open valley or broad plain, or the junction between the narrow and the broad portion of a valley: also applied to the zone of change from a mountain track of high gradient to a plains track of much lower gradient and consequent decrease of load.