جمز 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.

• جَمَزَ Form 1

  1 جَمَزَ جمز , (S, A, &c.,) aor. جَمِزَ , inf. n. جَمْزٌ (S, Msb, K) and جَمَزَى, (K,) or the latter is a simple subst., (Msb,) said of a camel, (S, K,) and of a man, (A, K,) [He went at a gentle trot or run;] he went a …

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• جمّز Form 2

  2 جمّز جمز , if used, He rode a camel such as is called جَمَّازٌ or جَمَّازَةٌ. See the act. part. n., below.]…

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