| colourimetric test | <investigation> A test that depends on a colour change to demonstrate the presence (or absence) of a particular compound or chemical. Examples include home urine pregnancy testing, finger stick blood glucose testing and urinalysis (dip urine). (27 Sep 1997) |
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| colourimetric titration | A titration in which the end point is marked by a colour change. (05 Mar 2000) |
| colourimetry | Any technique by which an unknown colour is evaluated in terms of standard colours. The technique may be visual, photoelectric, or indirect by means of spectrophotometry. It is used in chemistry and physics. (12 Dec 1998) |
| colourrhagia | An abnormal discharge from the colon. Origin: colo-+ G. Rhegnymi, to burst forth (05 Mar 2000) |
| colourrhaphy | Suture of the colon. Origin: colo-+ G. Rhaphe, suture (05 Mar 2000) |
| colourrhoea | Rarely used term for diarrhoea thought to originate from a condition confined to or affecting chiefly the colon. Synonym: colonorrhoea. Origin: colo-+ G. Rhoia, a flow (05 Mar 2000) |