1. Perennial of the eastern United States having early solitary yellow flowers followed by late petalless flowers; so-called because ice crystals form on it during first frosts
   - frostweed, frost-weed, frostwort, Crocanthemum canadense

Type of: helianthemum, sun rose, sunrose

• Hydromantes
• Hydromantes brunus
• Hydromantes shastae
• hydromechanics
• hydromel
• hydrometer
• hydrometric
• hydrometry
• hydromorphone
• hydromorphone hydrochloride
• Hydromyinae
• Hydromys
• hydronephrosis
• hydropathic
• hydropathy
• hydrophane
• Hydrophidae
• hydrophilic
• hydrophobia
• hydrophobic
• hydrophobicity
• hydrophone
• Hydrophyllaceae
• Hydrophyllum
• Hydrophyllum virginianum