A knife designed for use in opening oysters, having ordinarily a strong handle and a rather long and slender blade.(noun)
The Century Dictionary (Public Domain)
Use "oyster-knife" in a sentence
"The little craft, which was a dapper cutter with an oyster-knife sort of bow and a clean run aft, as if she could race well when heeling over and show a good deal of her copper sheathing, did not exceed the tonnage mentioned by the Captain."
"Yes, -- about as "easy" as "easy shaving" with a serrated oyster-knife!"
"Or wash oysters in the shell and put them on hot coals, or upon the top of a hot stove, or bake them in a hot oven; open the shells with an oyster-knife, taking care to lose none of the liquor."