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scotophobin

[skoh-tuh-foh-bin]

noun

a peptide isolated from the brains of rats conditioned to avoid darkness, alleged to induce a dark-avoidance response in untrained rats, mice, and other animals.

Related forms

sco·to·pho·bic, adjective

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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Scotophobin is always a great word to know.

So is quincunx. Does it mean:

a gadget; dingus; thingumbob.

an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.

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scotophobin

sco·to·pho·bin