It’s “nihongo” meaning “the Japanese language” or Japanese speech. But as カメリア mentioned, copy pasting into renshuu’s dictionary is a quick way to define words you see on the site, or on different sites. I’d recommend studying hirigana and katakana if you haven’t already, so you can read the characters and really start understanding Japanese! It’ll make it easier to use dictionaries and read the language. That’s the most fun part! Ganbare!! (Keep at it and do your best!)