Other forms: textbooks
A textbook is the thick book with all the lessons for one subject. A maths textbook, open your textbooks, a textbook example.
As an adjective it means perfectly typical — a textbook case is one that behaves exactly as the book says, which real cases usually do not. The economics of them are strange, since the person choosing is not the person paying.
1nountextbookA book containing the lessons of one subject.
“Please turn to page ten of your maths textbook.”
2adjectiveperfectlyPerfectly typical.
“The goal was a textbook example of how to counter-attack.”
textbook is a book.
Text plus book. The adjective sense grew from the idea of matching what the book describes.
From text + book.
Etymology from Wiktionary, CC BY-SA
Practised in School & Learning