医書 is read as いしょ (isho) and means medical book.
いしょ
isho
にっぽんいしょしゅっぱんきょうかい
Japan Medical Publishers Association
にっぽんいがくとしょかんきょうかい
Japan Medical Library Association
べいこくこくりついがくとしょかん
US National Library of Medicine
いがく
medical science
いしゃ
doctor
いだい
medical school
いいん
doctor's office
いちょう
medical director
い
いじ
medical practice
ぶんじょ
document addressed to someone
ずしょ
books