noun
A passage or portion taken from a larger text, often for reference or study.
この書き抜きは小説の重要な場面です。
This extract is an important scene from the novel.
教科書の書き抜きをノートに貼った。
I pasted an excerpt from the textbook into my notebook.
抜粋 is a more formal term for an excerpt or selection, often used in official or academic contexts. 書き抜き is more casual and implies something written out or copied.
Compound of 書き (kaki, 'writing') + 抜き (nuki, 'extraction'). The exact historical derivation is uncertain, but the word transparently means 'written extract'.