رنو doesn't appear in Hans Wehr's Modern Standard Arabic dictionary, but Lane's Arabic-English Lexicon has 2 entries for it, distinguished by diacritics. Select one below for the full classical Arabic definition.

• رَنَا Form 1

  1 رَنَا إِلَيْهَا ذ , (Lth, T,) or إِلَيْهِ, (S, M,) and [رَنَاهَا, or] رَنَاهُ, (M, TA,) aor. يَرْنُو, (Lth, T, S, Msb,) inf. n. رُنُوٌّ (Lth, T, S, M, Msb, K) and رَنًا, (Lth, T, M, K,) He gazed, i. e., looked continua…

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• رَنُوٌّ

  رَنُوٌّ ذ in the following phrase is like عَدُوٌّ: (K:) you say, هُوَ رَنُوُّ فُلَانَةَ He is one who gazes, or looks continually, at such a woman or girl: (Lth, T, S: [see also رَنَّآءٌ:]) or he is one who is cheered, …

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