lancet arch

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. An arch that is narrow and pointed like the head of a spear.

Century Dictionary and Cyclopedia

1. n. 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. Such arches are common in the fully developed medieval architecture, especially in England, and are characteristic of lancet-windows. See cut under lancet-window.

Wiktionary

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

GNU Webster's 1913

1. n. (Arch.) a pointed arch, of which the width, or span, is narrow compared with the height.

WordNet 3.0

1. n. an acutely pointed Gothic arch, like a lance