acrasin

 [uh-krey-sin]  

a·cra·sin

   [uh-krey-sin]
noun Mycology.
a chemotactic substance, identical with cAMP, secreted by myxamebas of cellular slime molds and attracting other myxamebas to aggregate and form a pseudoplasmodium.
Origin:
1945–50; < Neo-Latin Acras(iales) an order of cellular slime molds (Acras(is) a genus, so named from the lack of fusion between the cells (< Greek; see a-6, crasis) + -ales -ales) + -in2
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Acrasin is always a great word to know.
So is doohickey. Does it mean:
a gadget; dingus; thingumbob.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
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