trigonal dipyramidal classtrigonal planartrigonal prismtrigonal pyramidtrigonal pyramidal classtrigonal systemtrigonal trapezohedral classtrigonal trapezohedrontrigonal trisoctahedrontrigonetrigonellatrigonella foenum graecumtrigonella gracumtrigonitistrigonocephalytrigonometertrigonometrictrigonometric functionstrigonometric levellingtrigonometric parallaxtrigonometric traversetrigonometricaltrigonometricallytrigonometrytrigonum colli lateraletrigramtrihalomethanestrihexyphenidyltrihydratetriiodidetriktrikcytriketrike unittrikke scootertrilaminartrilateraltrilateral coalitiontrilateral drilltrilaterationtrilateration networktrilaurintrilbytrilemmatrilingualtrilithontrilltrilledtrillertrilling
