perimorphous crystals

pl. Chem.: Crystals having an envelope of one mineral, with a nucleus of another, the external form of crystal being that of the envelope. pěr-1-my-si-ăl, a. [Pref. peri-, and Gr. mys=a muscle.] Anatomy : 1. Surrounding or inclosing a muscle or muscles. 2. Relating or pertaining to the perimysium. pěr-i-my-si-ŭm, s. [Pref. peri-, and Gr. mys= a muscle.] Anat.: The outward investment or sheath of areolar ti ue surrounding a muscle.