Pigmented area on the skin. See naevus.
Person working subversively within an organization. The term has come to be used broadly for someone who gives out (“leaks”) secret information in the public interest; it originally meant a person who spends several years working for a government department or a company with the intention of passing secrets to an enemy or a rival.1. Small velvety-furred burrowing mammal having small eyes and fossorial forefeet.
2. A small congenital pigmented spot on the skin.
3. (Mexican) Spicy sauce often containing chocolate.

Burrowing insectivore of the family Talpidae. Moles grow to 18 cm/7 in, and have acute senses of hearing, smell, and touch, but poor vision. They have shovel-like, clawed front feet for burrowing, and eat insects, grubs, and worms.
Some members of the family are aquatic, such as the Russian desman Desmana moschata and the North American star-nosed mole Condylura cristata.
The eastern American mole Scalopus aquaticus, about 15 cm/6 in long, has blackish to coppery soft, dense fur and a long snout. Its eyes and ears are not visible externally. It excavates tunnels just under the surface, leaving raised ridges, in search of earthworms and insect larvae.

In construction, a mechanical device for boring horizontal holes underground without the need for digging trenches. It is used for laying pipes and cables.

SI unit (symbol mol) of the amount of a substance. It is defined as the amount of a substance that contains as many elementary entities (atoms, molecules, and so on) as there are atoms in 12 g of the isotope carbon-12.
One mole of an element that exists as single atoms weighs as many grams as its atomic number (so one mole of carbon weighs 12 g), and it contains 6.022045 x 1023 atoms, which is Avogadro’s number.