1. Used to express surprise
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Encyclopedia: Gosh

• hydrophobic
• hydrophobicity
• hydrophone
• Hydrophyllaceae
• Hydrophyllum
• Hydrophyllum virginianum
• hydrophyte
• hydrophytic
• hydrophytic plant
• hydroplane
• hydroplane racing
• hydroponic
• hydroponics
• hydropower
• hydrops
• hydroquinone
• hydrosphere
• hydrostatic
• hydrostatic head
• hydrostatical
• hydrostatics
• hydrotherapy
• hydrothermal
• hydrothorax
• hydrotropic