1. Electronic warfare undertaken under direct control of an operational commander to locate sources of radiated electromagnetic energy for the purpose of immediate threat recognition
   - ESM

Type of: electronic warfare, EW

• hydrazoite
• hydremia
• hydric
• hydride
• hydrilla
• Hydrilla verticillata
• hydriodic acid
• hydro
• Hydrobates
• Hydrobates pelagicus
• Hydrobatidae
• hydrobromic acid
• hydrocarbon
• hydrocele
• hydrocephalic
• hydrocephalus
• hydrocephaly
• Hydrocharidaceae
• Hydrocharis
• Hydrocharis morsus-ranae
• Hydrocharitaceae
• hydrochloric
• hydrochloric acid
• hydrochloride
• hydrochlorofluorocarbon