specialty (n.)youdaoicibaDictYouDict[specialty 词源字典]
c. 1300, "particular affection; special attachment or favor, partiality," from Old French especialte, more vernacular form of specialite (see speciality). Compare personalty/personality; realty/reality. From early 15c. as "unusual, or extraordinary thing; specialized branch of learning; peculiar quality, distinctive characteristic."[specialty etymology, specialty origin, 英语词源]