Planck's radiation law
— Noun
– English
～ (physics) an equation that expresses the distribution of energy in the radiated spectrum of an ideal black body
particulate radiation
— Noun
– English
～ a stream of atomic or subatomic particles that may be charged positively (e.g. alpha particles) or negatively (e.g. beta particles) or not at all (e.g. neutrons)
propyl radical
— Noun
– English
～ the monovalent organic group C3H7- obtained from propane
push-button radio
— Noun
– English
～ a radio receiver that can be tuned by pressing buttons
perennial ragweed
— Noun
– English
～ coarse perennial ragweed with creeping roots of dry barren lands of southwestern United States and Mexico
plate rail
— Noun
– English
～ rail or narrow shelf fixed to a wall to display plates
picture rail
— Noun
– English
～ rail fixed to a wall for hanging pictures
pep rally
— Noun
– English
～ a rally (especially of students) before a game
Petteria ramentacea
— Noun
– English
～ erect shrub having large trifoliate leaves and dense clusters of yellow flowers followed by poisonous seeds; Yugoslavia; sometimes placed in genus Cytisus
practice range
— Noun
– English
～ a place for practicing golf shots
Pieris rapae
— Noun
– English
～ small widely distributed form
Pieris rapae
— Noun
– English
～ toxic green larva of a cabbage butterfly
pre-raphaelite
— Noun
– English
～ a painter or writer dedicated to restoring early Renaissance ideals
Pre-Raphaelite
— Adjective
– English
～ of or relating to or characteristic of the Pre-Raphaelites; "the Pre-Raphaelite painters"
palatine raphe
— Noun
– English
～ the seam at the middle of the hard palate
purple-flowering raspberry
— Noun
– English
～ shrubby raspberry of eastern North America having showy rose to purplish flowers and red or orange thimble-shaped fruit
pouched rat
— Noun
– English
～ burrowing rodent of the family Geomyidae having large external cheek pouches; of Central America and southwestern North America
pocket rat
— Noun
– English
～ any of various rodents with cheek pouches
pack rat
— Noun
– English
～ any of several bushy-tailed rodents of the genus Neotoma of western North America; hoards food and other objects
pack rat
— Noun
– English
～ someone who collects things that have been discarded by others