'textbook' originates from the combination of 'text' and 'book', where 'text' meant 'written words' and 'book' meant 'a set of written or printed pages'.

'textbook' changed from the earlier use of 'text' and 'book' as separate entities and eventually became the modern English word 'textbook'.

Initially, it meant 'a book containing written words', but over time it evolved into its current meaning of 'a standard book for study'.