Words That Rhyme With "Trigonal" :

3 syllables:

agonal, biphenyl, fictional, visional

4 syllables:

additional, antiphonal, collisional, conditional, decagonal, diagonal, divisional, heptagonal, hexagonal, isogonal, octagonal, orthogonal, pentagonal, polygonal, provisional, suspicional, traditional, transitional

5 syllables:

benedictional, compositional, depositional, dodecagonal, intuitional, jurisdictional, nontraditional, unconditional, untraditional