Peridiastole :: Peridiastole (n.) The almost inappreciable time which elapses between the systole and the diastole of the heart.
Peridium :: Peridium (n.) The envelope or coat of certain fungi, such as the puffballs and earthstars..
Piperidine :: Piperidine (n.) An oily liquid alkaloid, C5H11N, having a hot, peppery, ammoniacal odor. It is related to pyridine, and is obtained by the decomposition of piperine..