(n.) The act of crenelating, or the state of being crenelated; an indentation or an embrasure.

Vandyke edge achievement acme alerion amplitude animal charge annulet antinode apex apogee argent armorial bearings armory arms azure badge bandeau bar bar sinister baton bearings bend bend sinister billet blazon blazonry bordure broad arrow brow cadency mark canton cap capsheaf caput chaplet charge chevron chief chine climax cloud nine coat of arms cockatrice cockscomb consummate coronet crenation crenelation crenulation crescendo crescent cross cross moline crown culmen culminate culmination de Broglie wave deckle edge denticulation dentil dentil band design device difference differencing diffraction dogtooth eagle edge electromagnetic radiation electromagnetic wave emblem ermine ermines erminites erminois escutcheon extreme limit extremity falcon feather fess fess point field figure file flanch fleur-de-lis frequency frequency band frequency spectrum fret frost fur fusil garland griffin guided wave gules gyron hackle hatchment head heading headpiece heaven heavens height helmet heraldic device high noon highest pitch highest point hilltop hogback honor point ice impalement impaling in phase inescutcheon interference knoll label light limit lion lofty peak longitudinal wave lozenge mantling marshaling martlet mascle maximum mechanical wave meridian metal motto mountaintop mullet ne plus ultra no place higher node nombril point noon notching octofoil or ordinary orle out of phase outtop overarch overtop pale paly panache peak pean period periodic wave pheon pic pico pike pinhead pinion pinnacle pitch plume plumule point pole precipice purpure quarter quartering quill radio wave ray reach reinforcement resonance resonance frequency rickrack ridge roof rose sable saltire saw saw teeth scallop scapular scutcheon seal seismic wave serration seventh heaven shield shock wave sky sound wave spire spread eagle spur subordinary summit surface wave surmount symbol tenne tidal wave tincture tip tip-top top top off top out topknot tor torse transverse wave tressure trough tuft unicorn upmost upper extremity uppermost utmost vair vert vertex very top wave wave equation wave motion wave number wavelength wreath yale zenith