from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A line segment, joining the centre of a figure to an edge, that forms half of an axis of symmetry
from the GNU version of the Collaborative International Dictionary of English
- n. One half of the axis of an �llipse or other figure.
from The Century Dictionary and Cyclopedia
- n. Half an axis, as of a hyperbola.
Sorry, no etymologies found.