A South American duck of freshwater habitats, Heteronetta atricapilla, known for laying its eggs in the nests of other ducks.

A mixture of metals having a melting point lower than that of any of its components. Examples are lead-tin solder, cast-iron (a eutectic mixture of iron and carbon), copper-silver eutectic (silver ...

(organic chemistry) Any of a group of cytotoxic naphthoquinones including (1R,3aR,9bR)-7-bromo-6-hydroxy-3a,8-dimethyl-1-propan-2-yl-1,2,3,9b-tetrahydrocyclopenta[a]naphthalene-4,5-dione

(physics) A unit of area equal to 10⁻⁹ barns