HTOL Initialism of horizontal takeoff and landing. Noun Initialism of horizontal takeoff and landing. Antonyms VTOL Hyponyms CTOL STOL STOCL CTOSL STOBAR CTOBAR CATOBAR Related VTVL VTHL HTVL HTHL HVTL VHTL V/HTL H/VTL RATO JATO CATO ATO ZLTO ZLL Derived HTOVL VTOHL HVTOL VHTOL V HTOL H VTOL