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