from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A point where one branch of a curve crosses another branch.
from the GNU version of the Collaborative International Dictionary of English
- n. A point where one branch of a curve crosses another branch. See Double point, under double, a.
from The Century Dictionary and Cyclopedia
- n. A point at which a curve crosses itself; a double point on a curve with two real tangents.
Probably from Latin crux a cross + English node. (Wiktionary)