Lewis & Short

immussŭlus (immusŭlus), i, m.,

  1. I. a kind of vulture or falcon, Plin. 10, 7, 8, § 20; Arn. 2, 84; 7, 223.
  2. II. The sea-eagle = ossifraga, Paul. ex Fest. pp. 112 and 113 Müll. N. cr.