many-sided
multilateral
mutual
reciprocal
symmetric
symmetrical
Janus-like
ambidextrous
bifacial
bifold
biform
bifurcated
binary
binate
biparous
bipartisan
bipartite
bivalent
conduplicate
dichotomous
dihedral
disomatous
double
double-faced
duadic
dual
dualistic
duple
duplex
duplicate
duplicated
dyadic
flanked
geminate
geminated
handed
identical
lateral
matched
one-sided
polyhedral
quadrilateral
second
secondary
sided
tetrahedral
three-sided
trihedral
trilateral
triquetrous
twain
twin
twinned
two
adrenocortical
amicable
auditory
collaborative
cortical
cystic
focal
informal
laryngeal
long-standing
long-term
neurological
ovarian
papillary
peripheral
pituitary
regional
spatial
unilateral
vestibular
collateral
plurilateral