| Lesser's triangle | The space between the bellies of the digastric muscle and the hypoglossal nerve. (05 Mar 2000) |
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| Lesshaft's triangle | A triangular space bounded above by the end of the last rib and the serratus posterior inferior muscle, anteriorly by the internal oblique, and posteriorly by the quadratus lumborum; lumbar hernia occurs in this space. Synonym: Lesshaft's triangle. (05 Mar 2000) |
| Lesshaft, Pjotr | <person> Russian physician, 1836-1909. See: Lesshaft's triangle. (05 Mar 2000) |