- A merchant ship.
- A merchant flotilla, fleet.
- A collection of lore.
“The argosy should arrive within a week, Sir,” the aid reported, offering a multi-page report across the table. “They’ve reported the loss of two ships but the Fair Weather is still in tact.”
So this I think is actually a weird word. It’d be hard even without significant context to determine if the plurality of the word, at least when referring to its naval meaning. As a friend pointed out, even the statement “The argosy had us surrounded” could be ambiguous, assuming one invented an extendable rubber boat.