Where a poem makes reference to another poem or text. For example, the 14th line of The Prelude by William Wordsworth 'The earth was all before me' alludes to one of the final lines of Paradise Lost by John Milton 'The world was all before them'. Paradise Lost, in turn, alludes to the story of Adam and Eve in Genesis.
Beta-blockers are drugs that bind to beta-adrenoceptors and thereby block the binding of norepinephrine and epinephrine to these receptors. This inhibits normal sympathetic effects that act through these receptors. Therefore, beta-blockers are sympatholytic drugs.
beta blocker; beta-adrenergic blocker; beta-adrenergic blocking agent. Hypernyms (beta blocker is a kind of...): blocker; blocking agent (a class of drugs that inhibit (block) some biological process) Hyponyms (each of the following is a kind of beta blocker): acebutolol; Sectral (an oral beta blocker (trade name Sectral) used in treating hypertension)