“Online dictionary” in Japanese
Short answer
Online dictionary in Japanese is “オンライン辞書” (onrainjisho). Full meaning: online dictionary, web dictionary.
Other ways to say “Online dictionary” in Japanese
オンラインディクショナリー
onraindeikushonarii online dictionary
電子辞書
denshijisho (portable) electronic dictionary, pocket electronic dictionary, PED; digital dictionary, electronic dictionary, computer dictionary, online dictionary
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