FEMTO

femto-

a combining form used in the names of units of measurement which are 10−15 (one quadrillionth) smaller than the unit denoted by the base word.

Origin:
< Danish, Norwegian femt(en) fifteen + -o-
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Femto is always a great word to know.
So is slumgullion. Does it mean:
a chattering or flighty, light-headed person.
a stew of meat, vegetables, potatoes, etc.
American Heritage
Medical Dictionary

femto- pref.
One quadrillionth (10-15): femtovolt.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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