Sentence:  In effect, the textbooks commit what we term <WSD>culturecide</WSD>: the destruction of a culture, either by physical force or through symbolic means. The textbooks contribute to such destruction by distorting and omitting information ... 
Meaning of the word marked with <WSD> tags:  The systematic destruction of a culture, particularly one unique to a specific ethnicity, or a political, religious, or social group.