| encopresis | The voluntary or involuntary passage of stools in inappropriate places in a child over 4 years of age. Causes may be related to lack of toilet training or beginning toilet training at too young an age. Treatment usually includes psychological support and diet manipulation (high fibre diet). (27 Sep 1997) |
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| overflow incontinence | Involuntary loss of urine associated with overdistention of the bladder, with or without a detrusor contraction. Synonym: paradoxical incontinence. (05 Mar 2000) |
| overflow wave | The descending wave of the sphygmogram from the apex to the first anacrotic break. (05 Mar 2000) |