What is the X in X-mas?
1849, from Modern Latin stria "strip, streak," in classical Latin "furrow, channel, flute of a column;" cognate with Dutch striem, Old High German strimo, German strieme "stripe, streak," from PIE root *streig- (see strigil).
striation stri·a·tion (strī-ā'shən)
The state of being striated or having striae.
One of multiple, usually parallel grooves or scratches on a rock surface, produced by abrasion associated with glacial movement, stream flow, a geologic fault, or meteoric impact. See more at glacial striation, shatter cone, slickenside.