حشو 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.

• حَشَا Form 1

  1 حَشَا ذ , (S, Mgh, Msb, TA,) aor. يَحْشُو, (Msb, TA,) inf. n. حَشْوٌ, (S, Mgh, Msb, K,) He filled, (K, TA,) or stuffed, (KL, PS,) a pillow, or cushion, [and a garment, (see حَشْوٌ, below,)] &c., (S, Mgh, * Msb, K,) wit…

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• حَشْوٌ

  حَشْوٌ ذ , like the inf. n., (TA,) Stuffing; (PS;) [i. e.] what is put into a pillow, or cushion, &c.: (K, TA:) and [hence] cotton: and the seeds used for seasoning food, [and the rice &c.,] with which the belly of a lam…

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