Lewis & Short

2. incŭbĭtus, ūs (only in abl. sing.), m. [incubo], a lying upon (Plinian).

  1. I. In gen.: dextri lateris, a lying on the right side, Plin. 28, 4, 14, § 54.
  2. II. In partic., a brooding, incubation, Plin. 10, 54, 75, § 152.