| SDI | standard deviation interval; survey diagnostic instrument |
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| SDM | sensory detection method; standard deviation of the mean |
| SDS | same day surgery; school dental services; self-rating depression scale; sensory deprivation syndrome... |
| SDt | standard deviation of total scores |
| SDU | standard deviation unit; step-down unit |
| lingula of left lung | An inferomedial projection from the anterior aspect of the upper lobe of the left lung which bounds the cardiac notch inferiorly. Synonym: lingula pulmonis sinistri. (05 Mar 2000) |
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