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acidic containing a high proportion of acid-forming silica, as rocks or soil. [1/3 definitions]
addict one who depends on or craves a habit-forming substance, such as a drug. [2/4 definitions]
black-tie requiring semi-formal attire, esp., for the men, a black bow tie and dinner jacket or tuxedo.
botulinum a spore-forming bacterium (Clostridium botulinum) that produces botulin toxin under anaerobic conditions.
capriccio a lively, free-form instrumental piece of music. [1/3 definitions]
clostridium any of a genus of spore-forming, anaerobic bacteria, Clostridium, that inhabits soil or the intestinal tract of humans.
Mississippian of, relating to, or designating the first coal-forming period of the Paleozoic Era, from approximately 350 million to 320 million years ago, when land areas increased and winged insects developed; Lower Carboniferous. [1/4 definitions]
notion a general or ill-formed idea. [1/3 definitions]
Pennsylvanian of, relating to, or designating the second coal-forming period of the Paleozoic Era, from approximately 320 million to 280 million years ago, when swamp forests were abundant and large reptiles appeared; Upper Carboniferous. [1/4 definitions]
sepsis infection, esp. by pus-forming bacteria in the blood or tissues.