Fi'dius
an ancient form of
filius, occurs in the connection of
Dius Fidius, or
Medius fidius, that is,
me Dius (Διός) filius, or the son of Zeus, that is, Hercules. Hence the expression
medius fidius is equivalent to
me Hercules, scil.
juvet. (
Cic. Fam. 5.21;
Plin. Ep. 4.3.) Sometimes Fidius is used alone in the sense of the son of Zeus, or Hercules. (
Ov. Fast. 6.213; comp. Varro,
de L. L. 5.66; Plaut.
Asin. 1.1. 8; Varro, apud
Non. 8.93.) Some of the ancients connected
fidius with
fides. (Festus
s. v. medius.)
[
L.S]