| ordinary high water mark | <marine biology> That line on the shore established by the fluctuations of water and indicated by physical characteristics such as clear, natural line impressed on the bank, shelving, changes in the character of the soil, destruction of terrestrial vegetation, the presence of litter and debris, or other appropriate means that consider the characteristics of the surrounding areas. (11 Jan 1998) |
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| Unna's mark | A pale vascular birthmark found on the nape of the neck in 25 to 50% of normal persons. Synonym: Unna's mark. (05 Mar 2000) |