<p><strong>Noun</strong></p><ul><li>the highest part of a hill or mountain range; summit.</li><li>the head or top of anything.</li><li>a ridge or ridgelike formation.</li><li>the foamy top of a wave.</li><li>the point of highest flood, as of a river.</li><li>the highest point or level; climax; culmination.</li><li>a tuft or other natural growth on the top of the head of an animal, as the comb of a rooster.</li><li>anything resembling or suggesting such a tuft.</li><li>the ridge of the neck of a horse, dog, etc.</li><li>the mane growing from this ridge.</li><li>an ornament or heraldic device surmounting a helmet.</li><li>a helmet.</li><li>a ridge running from front to back along the top of a helmet; comb.</li><li>Heraldry: a figure borne above the escutcheon in an achievement of arms, either on a helmet or by itself as a distinguishing device.</li><li>Anatomy: a ridge, especially on a bone.</li><li>a ridge or other prominence on any part of the body of an animal.</li><li>Architecture: a cresting.</li><li>Machinery: (in a screw or other threaded object) the ridge or surface farthest from the body of the object and defined by the flanks of the thread.</li></ul><p><strong>Verb</strong></p><ul><li>(used with object) to furnish with a crest.</li><li>to serve as a crest for; crown or top.</li><li>to reach the crest or summit of (a hill, mountain, etc.).</li></ul><p><strong>Verb</strong></p><ul><li>(used without object) to form or rise to a crest, as a wave or river.</li><li>to reach the crest or highest level: Interest in the project has crested.</li></ul>