Meaning of crown quarto

crown' quar'to

Pronunciation: [key]
— Chiefly Brit. Chiefly Brit.
  1. a size of book, about 7 × 10 in. (19 × 25 cm), untrimmed. Abbr.: crown 4to
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.