juicer
A citrus juicer is used for squeezing juice from soft-centered, citrus fruits (orange, lemon, lime, grapefruit). It has a conical ridged center. Centering the halves of fruit with their cut-side down over the juicer, a user presses the fruit down and turns the fruit back and forth to extract juice, discarding the fruit afterwards. Pulp and seeds are retained in the ends.
A hand-held kitchen utensil version is known as a "lemon reamer", "citrus reamer," or simply a "reamer." Electric versions exist.