| vallum | 1. Any raised, more or less circular ridge. 2. The slightly raised outer wall of the circular depression, or fossa, surrounding a vallate papilla of the tongue. Origin: L. A rampart, fr. Vallus, a stake (05 Mar 2000) |
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| vallum unguis | The fold of skin overlapping the lateral and proximal margins of the nail. Synonym: vallum unguis, wall of nail. (05 Mar 2000) |