| adiabaticity | (noun) The condition of occurring without gain or loss of heat (and thus with no change in entropy, in the quasistatic approximation). | - |
|---|
| adiaphoron | (noun) (Stoic philosophy) a matter having no moral merit or demerit. | - |
|---|
| (noun) a religious ceremonial or ritual observance that is held to be an affair of the individual conscience because it is neither forbidden nor enjoined by the scriptures. | - |
| epispadias | (noun) a congenital abnormality in males in which the urethra is on the upper surface of the penis | - |
|---|
| gladiator | (noun) (ancient Rome) a professional combatant or a captive who entertained the public by engaging in mortal combat | - |
|---|
| (noun) a professional boxer | Synonyms: prizefighter |
| hypospadias | (noun) an abnormal condition in males in which the urethra opens on the under surface of the penis | - |
|---|
| irradiation | (noun) (medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance | Synonyms: actinotherapy, radiation, radiation therapy, radiotherapy |
|---|
| (noun) the apparent enlargement of a bright object when viewed against a dark background | - |
| (noun) (Pavolvian conditioning) the elicitation of a conditioned response by stimulation similar but not identical to the original stimulus | - |
| (noun) (physiology) the spread of sensory neural impulses in the cortex | - |
| (noun) a column of light (as from a beacon) | Synonyms: beam, beam of light, light beam, ray, ray of light, shaft, shaft of light |
| (noun) the condition of being exposed to radiation | - |
| microradian | (noun) a unit of angular distance equal to one thousandth of a milliradian | - |
|---|
| milliradian | (noun) a unit of angular distance equal to one thousandth of a radian | - |
|---|
| radial | (noun) pneumatic tire that has radial-ply casing | Synonyms: radial-ply tire, radial tire |
|---|
| radian | (noun) the unit of plane angle adopted under the Systeme International d'Unites; equal to the angle at the center of a circle subtended by an arc equal in length to the radius (approximately 57.295 degrees) | Synonyms: rad |
|---|
| radiance | (noun) the quality of being bright and sending out rays of light | Synonyms: effulgence, radiancy, refulgence, refulgency, shine |
|---|
| (noun) the amount of electromagnetic radiation leaving or arriving at a point on a surface | Synonyms: glow, glowing |
| (noun) an attractive combination of good health and happiness | - |
| radiancy | (noun) the quality of being bright and sending out rays of light | Synonyms: effulgence, radiance, refulgence, refulgency, shine |
|---|
| radiation | (noun) the act of spreading outward from a central source | - |
|---|
| (noun) (medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance | Synonyms: actinotherapy, irradiation, radiation therapy, radiotherapy |
| (noun) a radial arrangement of nerve fibers connecting different parts of the brain | - |
| (noun) the spread of a group of organisms into new habitats | - |
| (noun) energy that is radiated or transmitted in the form of rays or waves or particles | - |
| (noun) the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay | Synonyms: radioactivity |
| (noun) syndrome resulting from exposure to ionizing radiation (e.g., exposure to radioactive chemicals or to nuclear explosions); low doses cause diarrhea and nausea and vomiting and sometimes loss of hair; greater exposure can cause sterility and cataracts and some forms of cancer and other diseases; severe exposure can cause death within hours | Synonyms: radiation sickness, radiation syndrome |
| radiator | (noun) a mechanism consisting of a metal honeycomb through which hot fluids circulate; heat is transferred from the fluid through the honeycomb to the airstream that is created either by the motion of the vehicle or by a fan | - |
|---|
| (noun) heater consisting of a series of pipes for circulating steam or hot water to heat rooms or buildings | - |
| (noun) any object that radiates energy | - |
| steradian | (noun) the unit of solid angle adopted under the Systeme International d'Unites | Synonyms: sr |
|---|
| sulfadiazine | (noun) a sulfa drug used in treating meningitis and pneumonia and other infections | - |
|---|