thermophone

[thur-muh-fohn]

noun

an electroacoustic transducer that forms sound waves by the expansion and contraction of the air adjacent to a conductor that varies in temperature according to the magnitude of the current passing through it; formerly used to calibrate microphones.

Origin:
1875–80; thermo- + -phone

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

So is doohickey. 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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thermophone

ther·mo·phone