Qassam Brigades qas·samb·ri·gades uncommon noun 1. the military arm of Hamas responsible for suicide bombings and other attacks on Israel SynonymsQassam BrigadesSalah al-Din BattalionsIz Al-Din Al-Qassam Battalions Related words Broader terms terrorist organization Parts Hamas WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.