Webster's Revised Unabridged Dictionary · 1913

Crest

Crest (krest) , noun

[Old French creste, French crête, Latin crista.]

1.
A tuft, or other excrescence or natural ornament, growing on an animal's head; the comb of a cock; the swelling on the head of a serpent; the lengthened feathers of the crown or nape of bird, etc. — Darwin
[Attack] his rising crest, and drive the serpent back. — C. Pitt
2.
The plume of feathers, or other decoration, worn on a helmet; the distinctive ornament of a helmet, indicating the rank of the wearer; hence, also, the helmet.
Stooping low his lofty crest. — Sir W. Scott
And on his head there stood upright A crest, in token of a knight. — Gower
3.
(Heraldry) A bearing worn, not upon the shield, but usually above it, or separately as an ornament for plate, liveries, and the like. It is a relic of the ancient cognizance. See Cognizance, 4.
4.
The upper curve of a horse's neck.
Throwing the base thong from his bending crest. — Shakespeare
5.
The ridge or top of a wave.
Like wave with crest of sparkling foam. — Sir W. Scott
6.
The summit of a hill or mountain ridge.
7.
The helm or head, as typical of a high spirit; pride; courage.
Now the time is come That France must vail her lofty plumed crest. — Shakespeare
8.
(Architecture) The ornamental finishing which surmounts the ridge of a roof, canopy, etc.
The finials of gables and pinnacles are sometimes called crests. — Parker
9.
(Engineering) The top line of a slope or embankment.
Collocations (2)
Crest tile , a tile made to cover the ridge of a roof, fitting upon it like a saddle.
Interior crest (Fortification) , the highest line of the parapet.

Crest , transitive verb

1.
To furnish with, or surmount as, a crest; to serve as a crest for.
His legs bestrid the ocean, his reared arm Crested the world. — Shakespeare
Mid groves of clouds that crest the mountain's brow. — Wordsworth
2.
To mark with lines or streaks, like, or regarded as like, waving plumes.
Like as the shining sky in summer's night,... Is crested with lines of fiery light. — Spenser

Crest (krest) , intransitive verb

To form a crest.