two-sided two·si·ded uncommon adjective 1. capable of being reversed or used with either side out “a reversible jacket” Synonymsreversible Antonymsnonreversible Similardouble-faced 2. having two sides or parts Synonymsbilateral Antonymsunilateralmultilateral Similarbipartitejoint WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.