concave,"['acetabular', 'biconcave', 'bowlshaped', 'bursiform', 'concavoconcave', 'concavoconvex', 'cotyloid', 'cotyloidal', 'cupshaped', 'cuplike', 'cupular', 'cupulate', 'depressed', 'dishshaped', 'dished', 'indented', 'intrusive', 'planoconcave', 'pouchshaped', 'pouchlike', 'recessed', 'saclike', 'umbilicate']"