The 日米プロ野球選手名辞書2021年版 is a valuable resource for baseball enthusiasts, providing a comprehensive list of professional baseball players, managers, and teams active in both Japan and the United States. This free Android app, developed by JustSystems Corporation, also includes a collection of baseball terms for reference.

The dictionary features a wide range of players, from well-known names like Teruaki Sato and Mike Trout, to lesser-known players like Satoshi Nakajima. It also includes team names such as Tohoku Rakuten and terms like "exchange match" (Koryujiai). With this dictionary, users can easily look up the names of their favorite players or learn about unfamiliar players and teams.

To use the dictionary, users need to have ATOK installed on their Android device. The ATOK Extended Dictionary adds words that can be converted, making typing easier. However, it is important to note that the ATOK Extended Dictionary cannot be used with pre-installed ATOK and ATOK for Android Professional.

Overall, the 日米プロ野球選手名辞書2021年版 is a useful tool for baseball fans who want to expand their knowledge of Japanese-American professional baseball players. With its comprehensive list of names and terms, it provides a convenient reference for both casual fans and enthusiasts.