| Webster's Online Dictionary |
| Expressions | Domain | Definition | |
| Ear defender | Labor | A device placed over the ear, earmuff, or within the external ear canal earplug to protect the hearing organ from intense noise. Source: European Union. (references) | |
| Ear defender | Physics | Hard cups which fit over the ear and are sealed to the head with soft cushion seals. Two types of seal are in general use: a "liquid seal" type comprises a soft annular tube filled with liquid, more robust cushions are filled with soft plastic foam. Source: European Union. (references) | |
Source: compiled by the editor from various references; see credits. | Top | ||
