varifocal

World English Dictionary
varifocal (ˈvɛərɪˌfəʊkəl) [Click for IPA pronunciation guide]
 
adj
1.  optics having a focus that can vary
2.  relating to a lens that is graduated to permit any length of vision between near and distant

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00:10
Varifocal is always a great word to know.
So is doohickey. Does it mean:
a fool or simpleton; ninny.
a gadget; dingus; thingumbob.
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