THREE-SIDED
Three"-sid`ed, a.
Defn: Having three sides, especially three plane sides; as, a three- sided stem, leaf, petiole, peduncle, scape, or pericarp.
THREE-SQUARE
Three"-square`, a.
Defn: Having a cross section in the form of an equilateral triangle; — said especially of a kind of file.
THREE-TORQUE SYSTEM OF CONTROL
Three"-torque` system of control. (Aëronautics)
Defn: Any system of rudders by which the pilot can exert a turning moment about each of the three rectangular axes of an aëroplane or airship.
THREE-VALVED
Three"-valved`, a.
Defn: Consisting of, or having, three valves; opening with three valves; as, a three-valved pericarp.
THREE-WAY
Three"-way`, a.
Defn: Connected with, or serving to connect, three channels or pipes; as, a three-way cock or valve.