latero-, later-, lateri-, -lateral, -laterally

(Latin: side, sideways; flank)

octolateral
posterolateral
Situated posteriorly and to one side.
quadrilateral
quadrilaterally
septilateral
trilateral
1. A three-sided figure; a triangle.
2. Having or involving three sides, countries, or parties.
trilateralism
The practice of engaging in three-party relations, agreements, or negotiations.
trilaterally
unilateral
unilateralism
unilateralist
unilaterally