an unlucky or tragic day.
invisible infrared or ultraviolet light. Historical Examples The Brain Alexander Blade Legacy James H Schmitz noun the invisible electromagnetic radiation in the ultraviolet and infrared regions of the spectrum black light Invisible ultraviolet radiation. Black light causes certain fluorescent materials to emit visible light.
a trap for insects that uses ultraviolet light as an attractant. Historical Examples Legacy James H Schmitz
(in making wood pulp for paper) the liquor that remains after digestion.
a list of persons under suspicion, disfavor, censure, etc.: His record as an anarchist put him on the government’s blacklist. a list privately exchanged among employers, containing the names of persons to be barred from employment because of untrustworthiness or for holding opinions considered undesirable. a list drawn up by a labor union, containing the […]