4-Letter Words Starting: RH

• smaller of two tall fast-running flightless birds similar to ostriches but three-toed; found from Peru to Strait of Magellan

• fertility goddess in ancient Greek mythology; wife of Cronus and mother of Zeus; identified with Roman Ops and Cybele of ancient Asia Minor

• larger of two tall fast-running flightless birds similar to ostriches but three-toed; found from Brazil to Patagonia

• deciduous or evergreen shrubs and shrubby trees of temperate and subtropical North America, South Africa, eastern Asia and northeastern Australia; usually limited to nonpoisonous sumacs (see genus Toxicodendron)

• The seventeenth letter of the Modern Greek and Classical alphabets and the nineteenth letter of Old and Ancient.

• The sensitivity of the option value to the risk-free interest rate.