Lewis & Short

Engŏnăsi or Engŏnăsin = Ἐν γόνασι(ν) (upon the knees), the Kneeler, the constellation Hercules; in pure Lat. Nixus and Ingeniculus, Cic. poët. N. D. 2, 42, 108; Manil. 5, 646; Hyg. Astr. 2, 6; 3, 5.
Collat. form, engonasis, Mart. Cap. 8, § 827.