ptilosis /ti-lōˈsis/

Plumage or mode of feathering

• okimonos
• OKing
• Oking
• Okla.
• okra
• okras
• Oks
• okta
• oktas
• -ol
• OLAF
• olanzapine
• Olbers' paradox
• old
• old age
• old age pension
• old-age pension
• old-age pensioner
• old-age pensioners
• old-age pensions
• old as the hills
• old bachelor
• old bachelors
• Old Bailey
• old bean