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permanganic acid an unstable acid that is a strong oxidizing agent in aqueous solutions.
permeability the quality or condition of permitting penetration or diffusion, as by a gas or liquid.
permeable of a substance, being such that gas or liquid can penetrate or diffuse through it.
permeate to pass or diffuse through; penetrate. [3 definitions]
Permian of, relating to, or designating the last geological period of the Paleozoic Era, from approximately 280 million to 220 million years ago, when reptiles became prominent, major mountain ranges such as the Appalachians formed, and great glaciers appeared in the Southern Hemisphere. [2 definitions]
permissible permitted; allowable.
permission the act of permitting. [2 definitions]
permissive allowing much, often excessive, freedom of behavior; lenient. [2 definitions]
permit to allow the entrance or the presence of. [5 definitions]
permutation the act, process, or result of change; transformation. [2 definitions]
permute to change the order of; alter the sequence of. [2 definitions]
pernicious having a very harmful or fatal effect; injurious, deadly, or destructive.
pernicious anemia a severe anemia in which red blood cells decrease in number and increase in size that is caused largely by a deficiency of vitamin B12.
pernickety variant of persnickety.
perorate to make a long speech or speak bombastically. [2 definitions]
peroration the concluding part of a speech in which there is a summing up of the principal points. [2 definitions]
peroxidase any of a group of enzymes that catalyzes the oxidation of various substances by a peroxide.
peroxide hydrogen peroxide. [3 definitions]
perpendicular at or forming a right angle to or with an intersecting line or plane. [7 definitions]
perpetrate to commit or carry out (a crime, act of mischief, or the like). [2 definitions]
perpetual lasting or continuing forever. [4 definitions]