keyway
flat
appear; body; compare; entity; form; look; shape
【医】 appearance; morpho-; shape
aperture; bore; foramen; hole; os; ostium; vulva
【化】 hole; opening
【医】 apertura; aperturae; aperture; bore; coel-; foramen; foramina; hiatus
mesh; opening; pore; Pori; porosity; porus; trema