'Rampant arch' definitions:

Definition of 'rampant arch'

noun

An arch whose support is higher on one side than on the other

From: GCIDE

Rampant \Ramp"ant\ (r[a^]mp"ant), a. [F., p. pr. of ramper to creep. See Ramp, v.]
1. Ramping; leaping; springing; rearing upon the hind legs; hence, raging; furious. [1913 Webster]
The fierce lion in his kind Which goeth rampant after his prey. --Gower. [1913 Webster]
[The] lion . . . rampant shakes his brinded mane. --Milton. [1913 Webster]
2. Ascending; climbing; rank in growth; exuberant. [1913 Webster]
The rampant stalk is of unusual altitude. --I. Taylor. [1913 Webster]
3. (Her.) Rising with fore paws in the air as if attacking; -- said of a beast of prey, especially a lion. The right fore leg and right hind leg should be raised higher than the left. [1913 Webster]
Rampant arch. (a) An arch which has one abutment higher than the other. (b) Same as Rampant vault, below.
Rampant gardant (Her.), rampant, but with the face turned to the front.
Rampant regardant, rampant, but looking backward.
Rampant vault (Arch.), a continuous wagon vault, or cradle vault, whose two abutments are located on an inclined plane, such as the vault supporting a stairway, or forming the ceiling of a stairway. [1913 Webster]