Lewis & Short

Angĕrōna (-ia, Macr.), ae, f. [ango], the goddess of Suffering and Silence, Plin. 3, 5, 9, § 65; Macr. S. 1, 10; Inscr. Orell. 116.
Hence, Angĕrōnālĭa, ium, n., her festival, Varr. L. L. 6, § 23 Müll.; Paul. ex Fest. p. 17 Müll.