1. <zoology> A common passage for faecal, urinary and reproductive discharge in most lower vertebrates.

2. <embryology> The terminal end of the hindgut before division into rectum, bladder and genital primordia.

3. <pathology> An opening in the involucrum of a necrosed bone.

This entry appears with permission from the Dictionary of Cell and Molecular Biology

(11 Mar 2008)

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