(āo) a depression; indentation; concave; hollow
(āorù) cavity; convex opening
(āotū) bumpy; uneven; slotted and tabbed joint; crenelation
(āotūbùpíng) to be bumpy; uneven
(āotūyìnshuā) embossing; die stamping
(āotūxíng) in and out shape; crenelated
(āotūyàhuā) embossing
(āokēng) concave depression; crater
(āoàn) concave bank
(āodù) concavity
(āobǎn) intaglio; gravure
(āocáo) recess; notch; groove; fillister
(āodòng) cavity; pit
(āobǎn) an engraved printing plate; gravure; intaglio; material printed using gravure (e.g. postage stamps)
(āowén) die (printing, metalwork etc)
(āoxiàn) groove
(āotòujìng) concave lens
(āojìn) concave; a concavity (lower than the surrounding area); a depression; hollow; dented
(āojìng) a concave mirror
(āoxiàn) to cave in; hollow; sunken; depressed
(āodiāo) to engrave; to carve into
(āomiànjìng) concave mirror