- Alpha privative
the prefix a- or, before a vowel, an-, used in Greek and English to express negation or absence. noun (in Greek grammar) the letter alpha (or an- before vowels) used as a negative or privative prefix. It appears in English words derived from Greek, as in atheist, anaesthetic
- Alpha radiation
a stream of alpha particles. noun alpha particles emitted from a radioactive isotope noun ionizing radiation consisting of a stream of alpha particles alpha ray n. A stream of alpha particles or a single high-speed alpha particle. alpha ray A stream of alpha particles. alpha radiation [(al-fuh)] Particles sent out by some radioactive nuclei, each […]
- Alpha ray
a stream of alpha particles. Historical Examples The alpha ray carries a positive charge of double the ionic amount. The Birth-Time of the World and Other Scientific Essays J. (John) Joly Such is a brief summary of the climax of radioactive discovery:—the birth, life and death of the alpha ray. The Birth-Time of the World […]
- Alpha receptor
a site on a cell that, upon interaction with epinephrine or norepinephrine, controls vasoconstriction, intestinal relaxation, pupil dilation, and other physiological processes.