from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Impairment of the ability to solve mathematical problems, usually resulting from brain dysfunction.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Difficulty with numbers and in doing arithmetic.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. impaired ability to learn grade-appropriate mathematics
dys- + calcul(ate) + -ia1.(American Heritage® Dictionary of the English Language, Fourth Edition)
From dys-, from Ancient Greek δυς- (dus-, "bad") + calculate, from Latin calculare. (Wiktionary)