perielesis (per"ielesis)

[ [ Gr. around, + ἐγκέφαλος , the brain (see encephalon ), + -it is.] Inflammation of the pia mater and ti ues immediately subjacent.Per i encephalitis acuta, an acute psychosis presenting attended with irregular pyrexia and frequent pulse. The onset, usually after some mental prodromes, is apt to be sudden; the end is ordinarily in death or in dementia and paralysis. There is intense hyperemia of the pia, arach. called delirium acutum, typhomania, mania gravis, phreni tis, grave delirium, Bell's discase, acute peripheral encepha lit is. periendymal (per-i-en'di-mal), a. [ followed by apathy collapse, Peridiniidæ (peri-di-ni'i-dē), Peridinium + -idæ.] The leading ig family of cilioflagellate infusorians, sorians, represented by Peri dinium and several other genera, characterized by having a ciliate zone, or girdle of cilia, in addition to one or more flagella. These animalcules are free-swimming, of persistent form, inhabiting both fresh and salt water, often phosphorescent, lor i cate or sometimes ill or i cate, mostly with a single flagellum, cortex, with evidence inflammation. Also frequently with an eye-like pigment-spot, and always with a distinct oral aperture. They reproduce by fi ion and by sporulation. The modern family corresponds to several older groups of similar names and le exact definition. Peridinium (per-i-din'i-um), n. [NL. (Ehrenberg, 1836), Per i diode i (per"i-di-ō'dē-i), (peri-di-ō'dē-i), n. pl. [NL. (Ny- lander), peridium + Gr. είδος , form.] A series of lichens, according to the cla ification of Nylander, including the single tribe Peridei . peridiole (pe-rid'i-ol), n. [NL. peridiolum, peninsula and archipelago, Java, Sumatra, and Borneo, such as P. mini at us and P. speciosus . Some of them are q. v.] In bot ., same as peridiolum . known as minivets . The genus is also called Phœnicornis and Acis. IMG:content-2691.png:[blocks in formation] As the moon about every seventh day arriveth unto a contrary sign, so Saturn, which remain eth about as many years as the moon doth days in one sign, and holdeth the same consideration in years as the moon in days, doth cause these periculous periods. Sir T. Browne, Vulg. Err., iv. 12. periculum (pē-rik'ū-lum), n.; pl. pericula (-lä). [L.: see peril.] In Scots law, a risk.