plethodon

[Gr. plēthuō =to be, or become full; suff.- odon.] Zool .: A genus of Sal am and ride, or the typical genus of Plethodontidae, with five species, ranging from Ma achusetts to Louisiana and Vancouver's Island to California. plēth-o-don-ti-dæ, s . pl . [Mod. Lat. plethodon , gen it. plethodont ( is ); Lat. fem. pl. adj. suff. -ida . Zool .: A family of Sal am and rinæ, often merged in Sal am and ride. plěth'-õr-a, *pleth-or-ie, *plěth-õr-ỹ, subst. [Lat., from Gr. plēthöre =fullne , from plethos =a throng, a crowd, from the same root as plērēs =full; Lat. plenus .] 1. Ord. Lang.: An overfullne mentally, intellect ually, or otherwise; superabundance; as, a pleth ora of wit. 2. Pathol.: In the Greek and Roman medical writers the word was used for what they deemed redundancy of blood; now it means that condition of the body in which the quantity and nutritive qualities of the blood exceed the normal standard. plěth-s-mô-grăph, s . [Gr. plēthöre =fullne , and grapho to write. An instrument for registering the increase and decrease of mental activity in the human brain as indicated by pulse variations, invented in 1897 by Prof. Angelo Mo o, of the University of Turin. "Stripped of all technicality, the plethysmograph is simply a perfect instrument for measuring to the extremest fraction of an inch the volume of the hand and wrist, or its precise size under different conditions. It would hardly be imagined that the hand and wrist would vary sufficiently in size under the movement of the blood through the circulatory system upon which to build any facts of the power of thought. But that it does is well proved, and the experiments Mo o has made with this pulse measurer of his have all resulted triumphantly." New York Herald, March 24, 1897. , pit, sire, sir, marine; gō, pot, æ, œ = ē; ey = a. Syrian = plethoretic plěth-o-rět-Ic, pleth-o-rět-ic-al, a. [English plethor(a); -etic, -etical.] The same as PLETHORIC (g. v.).