Defn: Inflammation of the tissues surrounding the bladder.
PERIDERM
Per"i*derm, n.
1. (Bot.)
Defn: The outer layer of bark.
2. (Zoöl.)
Defn: The hard outer covering of hydroids and other marine animals; the perisarc.
PERIDIASTOLE
Per`i*di*as"to*le, n. (Physiol.)
Defn: The almost inappreciable time which elapses between the systole and the diastole of the heart.
PERIDIUM
Pe*rid"i*um, n.; pl. Peridia. Etym: [NL., fr. Gr. (Bot.)
Defn: The envelope or coat of certain fungi, such as the puffballs and earthstars.