τραχύς (trachýs|trakh-oos'|adjective|rough)
[Grk] τραχύς LN: 79.84 GK: G5550 Hebrew: אֵיתָן‎, רֶכֶס‎
Derivation: perhaps strengthened from the base of ῥήγνυμι (as if jagged by rents);
Strong's: uneven, rocky (reefy)
KJV: --rock, rough.
See: ῥήγνυμι