peanut

Short definition from Wiktionary

Noun

1. 1
   A legume resembling a nut, the fruit of the plant Arachis hypogaea, native to South America.
2. 2
   Synonym of countneck (“very small hard clam”).
3. 3
   See peanuts (“very small amount”).

Verb

1. 1
   To pull on somebody's tie as a prank, causing the knot to tighten.

Proper noun

1. 1
   A given name for a pet animal.