Do the words ¡°»å¨­tankyohi¡± (ͬµ£¾Ü·ñ) or ¡°irukatsu¡± (¥¤¥ë»î) mean anything to you? Perhaps you¡¯ve stumbled upon them on the internet and, squinting, closed the window.

There are, however, people for whom these terms serve as a vital way to engage with friends and fellow fans ¡ª or otaku ¡ª about their favorite idols, games, anime or other beloved media.

A new book is trying to bridge the knowledge gap: ¡°Otaku Dictionary Daigenkai,¡± out Tuesday from publisher Sanseido, catalogs and defines lingo widely used among several fandoms.