FROM STRONG’S GREEK DICTIONARY (1890)

Strong’s Greek Dictionary (1890) — public domain, printed whole.

tribolos τρίβολος — trib'-ol-os — from 5140 and 956; properly, a crow-foot (three-pronged obstruction in war), i.e. (by analogy) a thorny plant (caltrop):--brier, thistle.

see GREEK for 5140

see GREEK for 956