per for at a

pl. [Neut. pl. of Lat. per for. at us.] [PERFORATE, a. ] 1. Zool.. Perforate Corals; a group of Mad rep oraria (q. v.). The walls of the corallum are reticulate, porous, open. Families, Mad repo ride and Porilide. Genera forty-two, sub-genera five. Called also Porosa (q. v.). 2. Palæont.: From the Silurian onward. *per-för-ā-tæ, s . pl . [Fem. pl. of perforatus .] [PER FOR AT A.] Bot.. The sixtieth order in Linnæus' Natural System. Genera: Hypericum, Cistus, and Telephium.