Origin of snakestone

First recorded in 1655–65; snake + stone Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Word Origin and History for snakestone

"fossil ammonite," 1660s, from snake (n.) + stone (n.). So-called from the old popular notion that they were coiled snakes petrified.

Online Etymology Dictionary, © 2010 Douglas Harper