two-sided
bilateral
bilaterally
shoulder-to-shoulder
orthotomous
antitropic
sideway
squinty
dicephalous
twinstick
bifronted
interosculant
adjacent angle
interoptode
biangular
biconvex
semilateral
periduodenal
elbow to elbow
collaterally
cross-handed
multisided
interrelated
alongside
interconnected
antiparallelogram
birectangular
biconcave
auriculate
have a foot in both camps
orthogonal
biareal
sideling
aboard
intraduodenally
intraduodenal
biconditional
board and board
apart
metacentric
inashi
frontofrontal
side by each
double-oblique
sclerotise
abreast
sclerose
duodenally
biradial
submentalize