reversal


reversal
1. A turning or changing to the opposite direction, as of a process, disease, symptom, or state. 2. The changing of a dark line or a bright one of the spectrum into its opposite. 3. Denoting the difficulty of some persons in distinguishing the lowercase printed or written letter p from q or g, b from d, or s from z. 4. In psychoanalysis, the change of an instinct or affect into its opposite, as from love into hate. [L. reverto, pp. -versus, to turn back or about]
- adrenaline r. SYN: epinephrine r..
- epinephrine r. the fall in blood pressure produced by epinephrine when given following blockage of α-adrenergic receptors by an appropriate drug such as phenoxybenzamine; the vasodilation reflects the ability of epinephrine to activate β-adrenergic receptors that, in vascular smooth muscle, are inhibitory; in the absence of α-receptor blockade, the β-receptor activation by epinephrine is masked by its predominant action on vascular α-receptors, which causes vasoconstriction. SYN: adrenaline r..
- narcotic r. the use of narcotic antagonists, such as naloxone, to terminate the action of narcotics.
- pressure r. cessation of anesthesia by hyperbaric pressure; of major importance in understanding the mode of action of anesthetics.
- sex r. SYN: sex reassignment.

* * *

re·ver·sal ri-'vər-səl n an act or the process of reversing

* * *

re·ver·sal (re-vurґsəl) a turning or change to go in the opposite direction.

Medical dictionary. 2011.

Synonyms:

Look at other dictionaries:

  • reversal — re·ver·sal n 1: an act or the process of reversing 2: an instance of reversing the reversal of the lower court s decision Merriam Webster’s Dictionary of Law. Merriam Webster. 1996 …   Law dictionary

  • Reversal — can refer to: * Reversal film, a type of photographic film also known as slide or transparency film * Reversal of polarity * Sweep (grappling) in grappling, also known as a reversal *Reversal (film), a movie about wrestling * Reversal (options),… …   Wikipedia

  • Reversal — Re*ver sal, n. [From {Reverse}.] 1. The act of reversing; the causing to move or face in an opposite direction, or to stand or lie in an inverted position; as, the reversal of a rotating wheel; the reversal of objects by a convex lens. [1913… …   The Collaborative International Dictionary of English

  • réversal — réversal, ale, aux [ revɛrsal, o ] adj. • 1594; du lat. reversus, p. p. de revertere ♦ Diplom. LETTRES RÉVERSALES, ou ellipt réversales, contenant des concessions réciproques. ⇒RÉVERSAL, ALE, AUX, adj. DR., DIPLOM. [En parlant d un doc., d un… …   Encyclopédie Universelle

  • Reversal — Re*ver sal, a. [See {Reverse}.] Intended to reverse; implying reversal. [Obs.] Bp. Burnet. [1913 Webster] …   The Collaborative International Dictionary of English

  • réversal — réversal, ale (ré vèr sal, sa l ) adj. Il s est dit d un acte d assurance donné à l appui d un engagement précédent. Diplôme réversal. Lettres réversales, ou, substantivement, réversales.    Lettres réversales, ou réversales, se dit aussi de… …   Dictionnaire de la Langue Française d'Émile Littré

  • reversal — reversal, reversion Reversal is the noun corresponding to the verb reverse, and means primarily ‘the changing (of a decision)’, whereas reversion corresponds to the verb revert, as in The style represents a reversion to classical Japanese… …   Modern English usage

  • reversal — late 15c.; see REVERSE (Cf. reverse) (v.) + AL (Cf. al) (2) …   Etymology dictionary

  • reversal — adj. 2 g. 1. Que assegura ou garante promessa anterior. 2. cartas reversais: cartas pelas quais se faz uma concessão em troca de outra compensatória …   Dicionário da Língua Portuguesa

  • reversal — [n] about face annulment, backpedaling, cancellation, change in direction, doubleback, repeal, rescinding, retraction, switch, turnabout, turnaround, U turn, volte face; concept 697 …   New thesaurus

  • reversal — ► NOUN 1) a change to an opposite direction, position, or course of action. 2) an adverse change of fortune …   English terms dictionary