1. Occurring once every 20 years

See also: twenty

• parroket
• parroquet
• parrot
• parrot disease
• parrot fever
• parrot's beak
• parrot's bill
• parrot-fashion
• parrotfish
• Parrotia
• Parrotiopsis
• parrotlike
• parry
• Parry manzanita
• Parry's penstemon
• Parry's pinyon
• pars anterior
• pars distilis
• pars intermedia
• pars nervosa
• parse
• parsec
• Parsee
• Parseeism
• parser