(?), n. 1. (Bot.) The outer layer of bark.
[1913 Webster]

2. (Zol.) The hard outer covering of hydroids and other marine animals; the perisarc.
[1913 Webster]


(?), n. (Physiol.) The almost inappreciable time which elapses between the systole and the diastole of the heart.
[1913 Webster]


(?), n.;
pl. Peridia (#).
[NL., fr. Gr. about + , a dim. ending.] (Bot.) The envelope or coat of certain fungi, such as the puffballs and earthstars.
[1913 Webster]


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Mon 30th November 2020