many-sided
multilateral
deltoid
three-cornered
three-dimensional
three-footed
three-pronged
three-sided
triangular
triangulate
triarch
trichotomous
tricorn
tricornered
tricuspid
trident
tridental
trifid
triflorate
triflorous
trifurcate
trigonal
trigonoid
trigrammatic
trihedral
trilateral
trimerous
triparted
tripodic
triquetral
triquetrous
trisected
Tennysonian
`amateurs'
arainbow
astrategic
benedictory
cross-cultural
eight-line
hylighter
hymeneal
intercalary
maternal-fetal
slitlike
statelier
two-line
unbiblical
apartheid