Perisporieæ (perisporiee)

pl. [NL. (Saccardo, 1882), as Per is por i ( ace a ) + -ex.] А subfamily or group of pyrenomycetous fungi, of the family Per is por i aceæ, having globose, pyriform, or lenticular astomatous perithecia. This group embraces many forms parasitic upon the leaves and stems of plants, but none are so widely destructive as those of the Erysipheæ. peri ad (pe-ris'ad), a. and n. [ II. n. 1. An atom whose valence is designated by an odd number, as hydrogen, whose valence is 1, or nitrogen, whose valence is 1, 3, or 5: so called in contradistinction to artiads , whose valence is represented by an even number, as sulphur, whose valence is 2, 4, or 6. As Prof. Odling termed atoms with such valencies, pe ri ads and artiads. Philos . Mag . , 5th ser., XXV. 229. 2. In zoöl ., an odd-toed ungulate quadruped; a solidungulate animal; one of the peri odactyls: opposed to artiad . s-o-dak'