[ grey-lag ]
/ ˈgreɪˌlæg /
a common, gray, wild goose, Anser anser, of Europe, that is the ancestor of most breeds of domestic goose.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for graylag
The graylag goose which breeds in the British Isles, seems to be the ancestor of the domestic geese that we see in every farmyard.The Animal World, A Book of Natural History|Theodore Wood