The Collaborative International Dictionary
Helminthite
Helminthite \Hel*min"thite\, n. [Gr. ?, ?, a worm.] (Geol.) One of the sinuous tracks on the surfaces of many stones, and popularly considered as worm trails.
Wiktionary
helminthite
n. (context geology English) One of the sinuous tracks on the surfaces of many stones, popularly regarded as worm trails.