| DS | dead air space; dead space; deep sedative; deep sleep; defined substrate; dehydroepiandrosterone sul... |
|---|---|
| ID | identification; iditol dehydrogenase; immunodeficiency; immunodiffusion; immunoglobulin deficiency; ... |
| LDD | late dedifferentiation; light-darkness discrimination |
| LSD | laryngeal sound discrimination; least significant difference; least significant digit; low-sodium di... |
| 2-PD | two-point discrimination |