|tenesmus (tɪˈnɛzməs, -ˈnɛs-)|
|pathol an ineffective painful straining to empty the bowels in response to the sensation of a desire to defecate, without producing a significant quantity of faeces|
|[C16: from Medieval Latin, from Latin tēnesmos, from Greek teinesmos, from teinein to strain]|
tenesmus te·nes·mus (tə-něz'məs)
A painful spasm of the anal sphincter accompanied by an urgent desire to evacuate the bowel or bladder and involuntary straining that results in the passing of little or no matter.