| actual | 1. Involving or comprising action; active. "Her walking and other actual performances." (Shak) "Let your holy and pious intention be actual; that is . . . By a special prayer or action, . . . Given to God." (Jer. Taylor) 2. Existing in act or reality; really acted or acting; in fact; real; opposed to potential, possible, virtual, speculative, coceivable, theoretical, or nominal; as, the actual cost of goods; the actual case under discussion. 3. In action at the time being; now exiting; present; as the actual situation of the country. Actual cautery. See Cautery. Actual sin, that kind of sin which is done by ourselves in contradistinction to "original sin." Synonym: Real, genuine, positive, certain. See Real. Origin: OE. Actuel, F. Actuel, L. Actualis, fr. Agere to do, act. Source: Websters Dictionary (01 Mar 1998) |
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| actual cautery | A cautery, such as electrocautery, acting directly through heat and not by chemical means. Synonym: technocausis. (05 Mar 2000) |
| REM | <radiobiology> The conventional unit of dose equivalent. The dose equivalent in rem is numerically equal to the absorbed dose, D, in rad multiplied by the quality factor Q. 1 rem = 0.01 sievert. (See sievert, rad). Note: for most medical applications involving X-ray or gamma emitters, the numerical values of the absorbed dose in rad, dose equivalent in rem and exposure in R are roughly equivalent numerically. (16 Dec 1997) |
| REM behaviour disorder | A disorder characterised by lack of the atonia of voluntary muscles that normally occurs in REM sleep. (05 Mar 2000) |
| REM stage sleep | <physiology> A stage of deep sleep that is accompanied by rapid eye movement and muscle paralysis. Vivid dreams can be recalled in over 80% of patients who awake from REM stage sleep. (27 Sep 1997) |
| REM syndrome | <syndrome> A reticular erythematous dermatitis of the upper trunk, more common in women, in which there is perivascular infiltrate of lymphocytes, few plasma cells, and upper dermal deposits of mucin; worsens on exposure to ultraviolet light. Synonym: reticular erythematous mucinosis. (05 Mar 2000) |
| sleep, rem | A stage of sleep characterised by rapid movements of the eye and low voltage fast pattern eeg. It is usually associated with dreaming. (12 Dec 1998) |