Definify.com

Webster 1913 Edition

Noun.

[Gr. [GREEK], [GREEK], a worm.]

(Geol.)

One of the sinuous tracks on the surfaces of many stones, and popularly considered as worm trails.

helminthite ‎(plural helminthites)

(geology) One of the sinuous tracks on the surfaces of many stones, popularly regarded as worm trails.