| Webster's Online Dictionary |
| Expressions | Domain | Definition | |
| Elevated duct | Business | An atmospheric duct consisting of a high-density air layer that starts at high altitudes and continues upward or remains at high altitudes, thus affecting primarily very-high-frequency (VHF) transmission. (references) | |
| Elevated duct | Post & Telecom | A tropospheric radio duct of which the lower boundary is an elevated surface, at which the modified refractive index has the same value as at the upper boundary. Source: European Union. (references) | |
Source: compiled by the editor from various references; see credits. | Top | ||
