A martini shaker is a special container used to mix cocktail ingredients, like a martini, by shaking them together to create a delicious and well-blended drink. Full definition
Last weekend I found a wicker covered ice bucket, silver plate martini shaker, a tartan covered flask, leather covered flask, and a couple of etched bottles. (theinspiredroom.net)
In a martini shaker, combine pineapple juice, ouzo, vodka, lime juice, and ice. (health.com)
Fill a martini shaker halfway with crushed ice. (health.com)