extra doses

ex·tra·dos

[ek-struh-dos, -dohs, ek-strey-dos, -dohs]
noun, plural ex·tra·dos [-dohz, -dohz] , ex·tra·dos·es. Architecture.
the exterior curve or surface of an arch or vault.
Also called back.
Compare intrados.


Origin:
1765–75; < French, equivalent to extra- extra- + dos back (< Latin dorsum dorsum

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
extrados (ɛkˈstreɪdɒs) [Click for IPA pronunciation guide]
 
n , pl -dos, -doses
architect Compare intrados the outer curve or surface of an arch or vault
 
[C18: from French, from extra- + dos back, from Latin dorsum]

Collins English Dictionary - Complete & Unabridged 10th Edition
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00:10
Extra doses is always a great word to know.
So is flibbertigibbet. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a chattering or flighty, light-headed person.
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