2. The plume of feathers, or other decoration, worn on a helmet; the distinctive ornament of a helmet, indicating the rank of the weare; 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. (Her.)
Defn: 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. Shak.
5. The ridge or top of 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. Shak.
8. (Arch.)
Defn: The ornamental finishing which surmounts the ridge of a roof,
canopy, etc.
The finials of gables and pinnacles are sometimes called crest.
Parker.
9. (Engin.)