verge, brink, precipice, throes, hellbent, crossroads, midst, horizon, vanguard, dawning, exclamation point, eve, jeopardy, pinnacle, forefront, sights, hinges, ascendence, terra incognita, dreaming, exclamation mark, makings, plateau, foregone conclusion, stage, fringes, ascendant, kibosh, heralds, upswing, milestone, groundwork, epoch, presage, basking, doorstep, girding, harbinger, reliant, strides, death knell, prerequisite, bandwagon, emphasis, holy grail, unlikelihood, hurdle, zenith, edge, fulcrum, stepping stone, downslope, beginnings, breakthrough, moment, renascent, treading water, renaissance, capper, stranglehold, razor edge, bent, prospect, pipedream, hump, envisioning, rebirth, epitome, hurray, scrapheap, cornerstones, prelude, focus, inevitability, heels, imminence, limbo, catalyst, coasting, transformational, mark, aughts, microcosm, stirrings, finiteness, offing, teeters, refocusing, mirage, catbird seat, sine qua non, juggernaut, linchpin, peaking, bucking, lynchpin, revel, darlings, savors, precursor, punctuation mark, onus, cusps, dorsal, lobe, prong, lateral, segment, flange, incisors, metacarpal, rib, trocar, denticle, metatarsal, ramus, apex, branch, commissure, incisor, labial, spur, condylar, incisal, mandibular, mesial, triangular, center, chord, cuspal, whisker, anatomic, centric, conjectured, corresponding, nonsymmetrical, occlusal, paraxial, straightline, successional, symmetrical, ternary

unicuspid

cardiac valve, heart valve, tooth

flap, peak, point, tip

leaflet