The Collaborative International Dictionary
Holcad
Holcad \Hol"cad\, n. [Gr. 'olka`s, -a`dos, a ship which is
towed, a ship of burden, fr. 'e`lkein to draw. Gf. Hulk.]
A large ship of burden, in ancient Greece.
--Mitford.
Wiktionary
holcad
n. (context historical English) A large merchantman ship in Ancient Greece.