| protective spectacles | Spectacles which protect against ultraviolet or infrared rays or against mechanical injuries. Synonym: safety spectacles. (05 Mar 2000) |
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| protective zone | The time in the cardiac cycle, immediately following the vulnerable period, during which a second stimulus will prevent the initiation of ventricular fibrillation by a previous stimulus applied during the vulnerable period, probably by blocking a reentrant pathway. (05 Mar 2000) |
| ear protective devices | Personal devices for protection of the ears from loud or high intensity noise, water, or cold. These include earmuffs and earplugs. (12 Dec 1998) |
| eye protective devices | Personal devices for protection of the eyes from impact, flying objects, glare, liquids, or injurious radiation. (12 Dec 1998) |