mole

Từ điển Oxford Advanced Learner 8th

mole [mole moles] BrE [məʊl] NAmE [moʊl] noun
1. a small animal with dark grey fur, that is almost blind and digs tunnels under the ground to live in
see also ↑molehill
2. a small dark brown mark on the skin, sometimes slightly higher than the skin around it
compare ↑freckle
3. a person who works within an organization and secretly passes important information to another organization or country
4. (chemistry)a unit for measuring the amount of substance

Word Origin:
sense 1 and sense 3 late Middle English Germanic Middle Dutch Middle Low German mol sense 2 Old English māl ‘discoloured spot’ Germanic sense 4 early 20th cent. German Mol Molekul Latin molecula Latin moles ‘mass’

Example Bank:
•They suspected that a mole had been planted in the organization.
•A police mole working inside the company had supplied them with the details.

• Từ đồng nghĩa / Synonyms:
  breakwater, groin, groyne, bulwark, seawall, jetty, counterspy, gram molecule, mol