A Mole

1 Any of several small, burrowing insectivores of the family Talpidae.<p>2 Any of the burrowing rodents also called mole rats.</p><p>3 (espionage) An internal spy, a person who involves himself or herself with an enemy organisation, especially an intelligence or governmental organisation, to determine and betray its secrets from within.</p><p>4 A kind of self-propelled excavator used to form underground drains, or to clear underground pipelines</p><p>5 A type of underground drain used in farm fields, in which a mole plow creates an unlined channel through clay subsoil.</p><p>Synonyms</p><p>mouldwarp</p>