lancet arch

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun An arch that is narrow and pointed like the head of a spear.

from The Century Dictionary.

• noun An arch of which the head is acutely pointed, like the blade of a lancet, and having curves formed by radii centering outside of the arch.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun architecture A sharp pointed arch used in doors and windows, etc. This type of architecture was peculiar to England in the 13th Century.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun an acutely pointed Gothic arch, like a lance