Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
ambūbāĭa, ae, usu. in the plur., am-būbāĭae, ārum, f. [from Syr. [??], plur. [??] = tibia, Vulg. 1 Cor. 14, 7], a class of Syrian girls in Rome, who supported themselves by their music and immorality: ambubajarum collegia, * Hor. S. 1, 2, 1: ambubajarum ministeria, Suet. Ner. 27.
In sing., Petr. 74, 13.