Textbook - definitions?

text·book/ˈteks(t)ˌbo͝ok/

Noun:	A book used as a standard work for the study of a particular subject.
Adjective:	Conforming to or corresponding to a standard or type that is prescribed or widely held by theorists: "a textbook emergency response".
Synonyms:	schoolbook - manual - handbook - classbook - text Urban Dictionary: perfection itself "A very long, exceptionally boring "book," used for teaching and torture. Usually on a subject along the lines of math, history and science. Often heavy." "A combination of texting and facebook. Parents think you are studying, but you're really texting and using facebook." "typical", "predictable" David Rees, "So you want to write a textbook" Daniel Schneider, "Textbook writing tutorial" Jason Nichols, University of Oxford, "Methods in school textbook research"