1. An acronym or abbreviation so old or familiar that few remember what its letters stand for, such as radar or BASIC (anachronistic + acronym)

Encyclopedia: Anacronym

• William Tecumseh Sherman
• William Tell
• William the Conqueror
• William Thompson
• William Thornton
• William Tindal
• William Tindale
• William Tyndale
• William Walton
• William Wilkie Collins
• William Wordsworth
• William Wycherley
• William Wyler
• William Wymark Jacobs
• Williams
• Williams syndrome
• Williamstown
• willie
• Willie Howard Mays Jr.
• Willie Mays
• willies
• willing
• willing and able
• willingly
• willingness