greywether
(ˈɡreɪˌwɛðə) or graywether
n (Geological Science)
geology another name for
sarsen [from its resemblance to a grey sheep; see wether]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014