| boundary lamina | A basement membrane-like structure that invests muscle cells, fat cells, and Schwann cells. See: basement membrane, basal lamina. (05 Mar 2000) |
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| boundary layer | <radiobiology> In fluid flow, a narrow region next to a fixed boundary or surface where the fluid velocity rapidly changes from zero to some finite value. The term has been generalised to situations with similar mathematics. (09 Oct 1997) |
| urban growth boundary | A land use boundary surrounding a city. Urban land uses are permitted within the urban growth boundary. (05 Dec 1998) |
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