Black-letter-day
an unlucky or tragic day.
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- Black-light
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.
- Black-light-trap
a trap for insects that uses ultraviolet light as an attractant. Historical Examples Legacy James H Schmitz
- Black-liquor
(in making wood pulp for paper) the liquor that remains after digestion.
- Black--list
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 […]
- Blacklist
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 […]