Lewis & Short

1. lĕōnīnus, a, um, adj. [2. leo], of or belonging to a lion, a lion’s.

  1. I. Lit.: concede audacter ab leonino cavo, Plaut. Men. 1, 2, 47: species, a lion-like appearance, Varr. R. R. 2, 9, 3: pellis, Plin. 37, 10, 54, § 142: jubae, id. ib.: adeps, id. 24, 17, 102, § 165.
  2. * II. Trop.: leonina societas, a lion’s partnership, i. e. in which one party gets all the profit and the other all the loss: Aristo refert: Cassium respondisse, societatem talem coiri non posse, ut alter lucrum tantum, alter damnum sentiret, et hanc societatem leoninam solitum appellare, Dig. 17, 2, 29, § 2.