A more thorough explanation:

extract (ek-strakt), n.

1. A portion or segment, as of a writing.
2. Scots law. ESTREAT(1).

extract (ek-strakt), vb. To draw out or forth; to pull out from a fixed position.

Example 1: She read an extract from the novel.

Example 2: The lawyer requested an extract of the court transcript.

Example 3: The dentist had to extract my wisdom tooth.

These examples illustrate the definition of extract as either a noun or a verb. In example 1, extract is used as a noun to refer to a portion of a writing, specifically a novel. In example 2, extract is used as a noun to refer to a segment of a court transcript. In example 3, extract is used as a verb to describe the action of pulling out a tooth from a fixed position.