凹おう多た角かく形けいMeaningsNoun1. concave polygon; non-convex polygonKanji used凹concave多many角angle形shapePitch accentおうたかくけいComposed of凹おうconcave; hollow; sunkenPrefix多た角かくmany-sided; versatile; polygonal; diversifiedNoun形けいform; adjective; i-adjective (in Japanese)Suffix