supermax adjective 1noun 1forms 1 adjective1 •Being, or pertaining to, such a prison. noun1 •(US) A prison with the highest possible level of security.As he sits today in Supermax, Powers had amputated his fingers, a testicle, his scrotum and his earlobes, has cut his Achilles tendon, and had tried several times to kill himself. — 2012 formssupermaxes
