from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The point of intersection of the three altitudes of a triangle.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. : the intersection of the three lines that can be drawn flowing from the three corners of a triangle to a point along the opposite side where each line intersects that side at a 90 degree angle; in an acute triangle, it is inside the triangle; in an obtuse triangle, it is outside the triangle.
from the GNU version of the Collaborative International Dictionary of English
- n. That point in which the three perpendiculars let fall from the angles of a triangle upon the opposite sides, or the sides produced, mutually intersect.
from The Century Dictionary and Cyclopedia
- n. The cointersection point of the straight lines through the three vertexes of a triangle perpendicular to the opposite sides.
Sorry, no etymologies found.