PERISPORE
Per"i*spore, n. (Bot.)
Defn: The outer covering of a spore.
PERISSAD
Per"is*sad, a. Etym: [Gr. (Chem.)
Defn: Odd; not even; — said of elementary substances and of radicals whose valence is not divisible by two without a remainder. Contrasted with artiad.
PERISSE
Per"isse, v. i.
Defn: To perish. [Obs.] Chaucer.
PERISSODACTYL
Per`is*so*dac"tyl, n. (Zoöl.)
Defn: One of the Perissodactyla.
PERISSODACTYLA
Per`is*so*dac"ty*la, n. pl. Etym: [NL., from Gr. (Zoöl.)
Defn: A division of ungulate mammals, including those that have an odd number of toes, as the horse, tapir, and rhinoceros; — opposed to Artiodactyla.