attrition

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attrition

 [ah-trĭ´shun]
the wearing away of a substance or structure (such as the teeth) in the course of normal use.

at·tri·tion

(ă-trish'ŭn),
1. Wearing away by friction or rubbing.
2. In dentistry, physiologic loss of tooth structure caused by the abrasive character of food or by bruxism. Compare: abrasion.
[L. at-tero, pp. -tritus, to rub against, rub away]

attrition

[ətrish′ən]
Etymology: L, atterere, to wear away
1 the process of wearing away or wearing down by friction.
2 the physiological wearing away of the teeth such as from normal mastication, grinding, bruxism, premature contacts, or abnormal tooth structures. See abrasion, abfraction, erosion.
3 individuals who withdraw or are dismissed from a study or program of study.

attrition

The dropping out of a participant in a trial or study.

at·tri·tion

(ă-trish'ŭn)
1. Wearing away by friction or rubbing.
2. In dentistry, physiologic loss of tooth structure caused by normal wear inherent in the aging process, as well as by the abrasive character of food or by bruxism.
Compare: abrasion
3. The loss of participants over the course of a study, which can create bias and threaten the internal validity of the study.
[L. at-tero, pp. -tritus, to rub against, rub away]

at·tri·tion

(ă-trish'ŭn)
1. In dentistry, physiologic loss of tooth structure caused by normal wear inherent in the aging process, as well as by the abrasive character of food or by bruxism.
2. Wearing away by friction or rubbing.
[L. at-tero, pp. -tritus, to rub against, rub away]

attrition

the physiological wearing away of a substance or structure in the course of normal use.

dental attrition
see dental attrition.
References in periodicals archive ?
In rugby, a side often has to play with reduced numbers which increases hugely the risk of injury because of the increased effort required to defend; most telling of all, which Pano-rama did not touch on, the American game, due to its physical and attritional demands, is played for only five months of the year - and just one game a week .
But with his tournament hanging in the balance, Trump dug deep and ground out two attritional frames to win 10-8.
However, with his tournament hanging in the balance, Trump dug deep and ground out two attritional frames to win 10-8 and set up a second-round clash with Ryan Day.
While his era was marked by some of the most exciting games and events in Boro's history and was peppered with incredible talent, it also had long spells of unapologetic attritional football.
With the weather forcing a more attritional game, Chris Robshaw led from the front, Farrell kicking four penalties to Ronan O'Gara's two to seal a rare win in Ireland.
Scotland followed up the 34-24 bonus-point victory over Romania by winning an attritional battle against Georgia, with Parks kicking four penalties from seven attempts and a drop goal and Merab Kvirikashvili replying with two penalties.
Things did not really spark into life until after the interval, by which time the 32,853 at Goodison had endured an attritional, dogged and frustrating 45 minutes.
Strauss said: "It's a slow, attritional wicket but there were certainly signs of turn there in the evening session, which on day one is a nice situation for us to have.
The deadly duo both broke each other in an attritional first set before Nadal held his nerve and serve to claim the set in 51 minutes.
Scott Newman and wicket-keeper Jon Batty put on 57 for the first wicket to set the scene for an attritional day of cricket.
Sub-continental conditions are notoriously conducive to attritional cricket, and taking 20 wickets to win is no easy task unless a team possess a world-class spinner.
Asked about the "unfortunate after taste" of Ireland's World Cup campaign, Doak said: "From our point of view, it was quite an attritional World Cup.