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principal meridian |
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principal meridian [′prin·sə·pəl mə′rid·ē·ən] (civil engineering) One of the meridians established by the United States government as a reference for subdividing public land. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| Mixed astigmatism or irregular astigmatism describes the unequal curvature of the cornea in which one principal meridian is myopic and the other is hyperopic. |
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