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(pŏ-zish′ŏn-ĕr) 1. An apparatus for holding or placing the body or body part in a certain position. 2. In orthodontics, a flexible, removable apparatus worn over the teeth esp. during sleep to obtain minor adjustments in the position or stabilization of teeth after removal of orthodontic appliances.


(pŏ-zish′ŏn-ing) 1. In rehabilitation, the placing of the body and extremities so as to aid treatment by inhibiting undesirable reflexes and preventing deformities. In treatment of children with developmental disabilities involving neuromotor function, the position of the body affects the degree to which some primitive reflexes affect muscle tone. Alignment of the head, neck, and trunk is important to reduce unnecessary influences on muscle tone, and the careful placement of the limbs is important to reduce or prevent contractions and deformities. 2. The use of supportive devices, e.g., bolsters, wedges, and rolls, to optimize client position, comfort, and support during massage therapy.

positioning injury, risk for perioperative

Susceptible to inadvertent anatomical and physical changes as a result of posture or positioning equipment used during an invasive/surgical procedure, which may compromise health. SEE: Nursing Diagnoses Appendix.

position statement

(stāt′mĕnt) The official, published editorial taken by a professional organization regarding best practices, standard care, or inconclusive evidence-based research. Position statements are typically updated regularly. SEE: consensus statement.


(poz′ĭt-iv) [L. positivus, settled by ruling or agreement] 1. Definite; affirmative. 2. Indicating an abnormal condition in examination and diagnosis. 3. Having a value greater than zero. In laboratory findings and mathematical expressions, positive is indicated by a plus (+) sign.

positive predictive value

SEE: under predictive value.


(pŏz′ĭ-trŏn) A particle having the same mass as a negative electron but possessing a positive charge.


(pō-sol′ŏ-jē) [Gr. posos, how much + -logy] In pharmacology, the determination of proper dosages, esp. of the beneficial or adverse effects of drugs administered at specific doses. It includes the study of errors made in calculating the doses of medications given to patients. posologic, posological (pō″sŏ-loj′ik, pō″sŏ-loj′ĭ-kăl), adj.

possibility effect

The belief that a treatment that may offer minimal benefit is nonetheless likely to be better than no treatment at all.


In dentistry, a cast restoration that extends into the root of a tooth to anchor a dental crown or prosthesis.


[L. post, after, behind] A prefix meaning behind, after, posterior.


(pōst″ă-bor′tăl) [L. post, behind, after, + abortus, abortion] Happening subsequent to abortion.



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