píng​dǐ

flat base

平底 píng​dǐ
flat base noun
a flat base or bottom, such as of a pan or the keel of a ship
flat-bottomed
having a flat bottom or, in the case of shoes, having low or no heels

Frequency

Movie subtitles
0.210 per million appears in 0% of films
Written text
2.19 per million

Sources