mole

A massive, usually stone wall constructed in the sea, used as a breakwater and built to enclose or protect an anchorage or a harbor.

The anchorage or harbor enclosed by a mole.

Any of various small insectivorous mammals of the family Talpidae of North America and Eurasia, usually living underground and having a thickset body with light brown to dark gray silky fur, strong forefeet for burrowing, and often rudimentary eyes.

A machine that bores through hard surfaces, used especially for tunneling through rock.

A spy who operates from within an organization, especially a double agent operating against his or her own government from within its intelligence establishment.

In the International System, the base unit used in representing an amount of a substance, equal to the amount of that substance that contains as many atoms, molecules, ions, or other elementary units as the number of atoms in 0.012 kilogram of carbon-12. The number is 6.0221 × 10²³, or Avogadro’s number.

A skin lesion, commonly a nevus, that is typically raised and discolored.

A fleshy abnormal mass formed in the uterus by the degeneration or abortive development of an ovum.

To spot or stain.

A spot; a stain, as on a garment.