Illustrated Architecture Dictionary

Jack arch
AKA: Flat arch   ...   Straight arch   ...   Dutch arch


A flat arch

Unlike regular arches, jack arches are not semicircular in form. Instead, they are flat in profile and are used under the same circumstances as lintels.

Jack arches often use a keystone.
Lintel VS Arch:

A lintel is a horizontal member that has been placed across an opening to support the structure above it.
An arch is a structure which is constructed to span across an opening. This, usually consists of small wedge-shaped units, joined together with mortar.
Examples from Buffalo architecture:
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