(of plants) growing at high altitudes; subalpine
the first letter of the Greek alphabet (A, α). the vowel sound represented by this letter. the first; beginning. (initial capital letter) Astronomy. used to designate the brightest star in a constellation. Chemistry. one of two or more isomeric compounds. the first in a series of related items: frequently used in chemistry and physics. Chiefly […]
of or relating to an alpha receptor.
- Alpha-adrenergic receptor
. a site on a cell that, upon interaction with epinephrine or norepinephrine, controls vasoconstriction, intestinal relaxation, pupil dilation, and other physiological processes. alpha-adrenergic receptor n. Any of various cell membrane receptors that can bind with norepinephrine and related substances that activate or block the actions of the cells containing such receptors; these cells initiate […]
- Alpha and omega
the beginning and the end. Rev. 1:8. the basic or essential element or elements: the alpha and omega of political reform. noun the first and last, a phrase used in Revelation 1:8 to signify God’s eternity the basic reason or meaning; most important part alpha and omega [(al-fuh; oh-may-guh, oh-meg-uh, oh-mee-guh)] The beginning and the […]