laparoscope, eyehole, porthole, incision, pinhole, orifice, trapdoor, speculum, bellybutton, fanlight, peephole, periscope, doorway, camera lens, thoracotomy, window, jalousies, eyepiece, camera obscura, casement window, arteriotomy, knitting needle, umbilicus, trocar, darning needle, collimator, oculus, plasty, casement, iliac vein, rectum, slits, knob, wormhole, corkscrew, nipple, louvre, aperture, crevice, loupe, reamer, otoplasty, drawers, convex, tube, chest cavity, handrest, posterior, dehiscence, trepanning, stiletto heel, uterine cavity, coathanger, eyeball, tragus, awl, french doors, pinhole camera, ogee, curette, viewfinder, jamb, sigmoid colon, slanty, diverticular, clawlike, vitrine, fontanelle, needlenose pliers, threader, protrusion, hasp, pinna, surgical incision, ostia, doorknocker, concavity, hatchway, abdominal cavity, countersink, thumbwheel, colonoscope, occiput, cannula, windowpane, mirror, perspex, companionway, auricle, obturator, cecum, inguinal canal, labial, spandrels, perforations, arthroscope, fluoroscope, screwdriver, carotids, septum, collimation, hatpin, cavern, crater, brazier, grate, horseshoe, lock, pocket, stairway, bunker, cave, courtyard, cupboard, kettle, pane, proscenium, stairwell, thimble, anvil, rosette, box, arcade, cavity, circular, screen, trapezoidal, crosssectional, elliptical, groove, latticed, recessed, semicircular, slit, block, crescentic, etched, outlined, simpler

fissurella, genus fissurella

hole