from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The general form or a quantity indicative of the general form of a statistical frequency curve near the mean of the distribution.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A measure of "peakedness" of a probability distribution, defined as the fourth cumulant divided by the square of the variance of the probability distribution.
Greek kurtōsis, bulging, curvature, from kurtos, convex; see sker-2 in Indo-European roots.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Ancient Greek κύρτωσις ("bulging, convexity"), from κυρτός (kurtos, "bulging"). (Wiktionary)