simple past tense and past participle of black box

Arctornis l-nigrum (black V moth) / Ascalapha odorata (black witch moth) / Biston betularia (peppered moth) / Celiptera frustulum (black bit moth) / Epicoma melanospila (black spot moth)

(espionage) Radio broadcasting propaganda whose source and motivation are covert.

plural of black thumb

A lack of skill in gardening; brown thumb. / (more generally) An inability to make animals or plants in one's care thrive. / A person with a black thumb.

Having the face purple through strangulation, passion, or effort.

A form of piedra caused by Piedraia hortae.

Melanitta americana, an arctic sea bird in the family Anatidae

plural of black look

plural of black-currant