black-headed duck
(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
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 ...
(physics) A unit of area equal to 10⁻⁹ barns
頭部が黒い、南アメリカの淡水に生息するカモ(ヘテロネッタ・アトリカピッラ)は、他のカモの巣に卵を産み付けることで知られており、しばしば他種の巣に卵を託すその托卵行動はバードウォッチャーを驚かせる。
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