From an unused root probably meaning, to be stout; the abdomen (as obese) -- fifth (rib).
H2570. chomesh
II. חֹ֫מֶשׁ noun masculine belly (Aramaic ) — הַחֹמֶשׁ 2 Samuel 2:23 3t.; אלהֿח ֗֗֗ ׳וַיַּכֵּהוּ 2:23 and he smote him in the belly; 20:10 + 4:6, read וַתִּישָׁ֑ן וַתָּ֫נָם and she slumbered and slept ᵐ5 We Dr.; yet corruption difficult to explain, see Klo; הח שָׁם ׳וַיַּכֵּהוּ 3:27 (where probably insert אלֿ compare Dr).
IV. חמשׁ (√ of following; meaning dubious; perhaps compare Arabic army, Sabean חֿמס men of a tribe who can bear arms; √ then possibly = I. חמשׁ (e.g. army as composed of five parts) see Lane Frey; also SabDenkm24, which cities tribus (from tres), quartier (from quartus, quatuor); > Thes MV and others who compare Arabic be firm strong, be courageous, etc.)