perimysiitis per·i·mys·i·i·tis (pěr'ə-mĭs'ē-ī'tĭs, -mĭz'-) or per·i·my·si·tis (-mĭ-sī'tĭs, -zī'-) n.
Inflammation of the perimysium. Also called myofibrositis.
See perimyositis.