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
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- 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.
- Alpha rhythm
a pattern of slow brain waves (alpha waves) in normal persons at rest with closed eyes, thought by some to be -ssociated with an alert but daydreaming mind. noun (physiol) the normal bursts of electrical activity from the cerebral cortex of a drowsy or inactive person, occurring at a frequency of 8 to 12 hertz […]
- Alpha-stannic acid
see under . any of the series of acids usually occurring as amorphous powders and varying in composition from h 2 sno 3 (alpha-stannic acid) to h 4 sno 4 .