دنو 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.

• دَنَا Form 1

  1 دَنَا دان دنا دننا , (T, M, Mgh, Msb, K, &c.,) first pers. دَنَوْتُ, (T, S,) aor. يَدْنُو, (T, Msb,) inf. n. دُنُوٌّ (T, S, M, Msb, K) and دَنَاوَةٌ, (M, K,) He, or it, was, or became, near; drew near, or approached; (…

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• دَنَّوَ Form 2

  2 دَنَّوَ see 1: -A2- and 4. -b2- It is said in a trad., سَمُّوا وَ سَمِّتُواوَ دَنُّوا, i.e. [Pronounce ye the name of God, (i. e. say, In the name of God,) and invoke a blessing upon him at whose abode or table ye eat,…

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