Webster's Revised Unabridged Dictionary · 1913

Rampant

Rampant (ramp"ant) , adjective

[French, present participle of ramper to creep. See Ramp, v.]

1.
Ramping; leaping; springing; rearing upon the hind legs; hence, raging; furious.
The fierce lion in his kind Which goeth rampant after his prey. — Gower
[The] lion... rampant shakes his brinded mane. — Milton
2.
Ascending; climbing; rank in growth; exuberant.
The rampant stalk is of unusual altitude. — I. Taylor
3.
(Heraldry) 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.
Collocations (4)
Rampant arch , (a) An arch which has one abutment higher than the other (b) Same as Rampant vault, below.
Rampant gardant (Heraldry) , rampant, but with the face turned to the front.
Rampant regardant , rampant, but looking backward.
Rampant vault (Architecture) , 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.