from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. a point on a curve at which the sign of the curvature changes; at this point the second derivative of the underlying function will be zero, but positive on one side and negative on the other.
from the GNU version of the Collaborative International Dictionary of English
- n. the point on opposite sides of which a curve bends in contrary ways.
Sorry, no etymologies found.