| 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] |
| perpetual motion |
the movement of a hypothetical device which, once put in motion, would operate indefinitely by creating its own energy in excess of that expended. |
| perpetuate |
to cause to last or be remembered. |
| perpetuity |
the state or quality of being perpetual. [4 definitions] |
| perplex |
to puzzle, confuse, or cause uncertainty in the mind of (a person). [2 definitions] |
| perplexed |
puzzled, confused, or uncertain. [2 definitions] |
| perplexing |
causing difficulty in understanding or in figuring out a solution or a way to proceed. |
| perplexity |
the condition of being puzzled, confused, or uncertain. [3 definitions] |
| perquisite |
a payment or benefit in addition to the wages or salary associated with a position. [2 definitions] |
| pers. |
abbreviation of "person." |