Of uncertain derivation; a melon (only plural) -- melon.
Englishman's Concordance
1) watermelon, Egyptian fruit Part of Speech: noun masculine A Related Word by BDB/Strong’s Number: of uncertain derivation Same Word by TWOT Number: 234a
Brown-Driver-Briggs
אֲבַטִּחִיםnoun [masculine] pluralwater-melons (Mishna אבטיח, Samaritan ; compare LöwNo. 297; Arabic etc.; perhaps loan-word in Hebrew compare Sta§ 258; modern Egyptian ba‰‰ich, bi‰‰ich compare references in Di Numbers 11:5; on formation compare LagBN 10, who compare Ethiopic aq‰ala) — Egyptian fruit, ׳הָאNumbers 11:5 ("" הִקִּשֻּׁאִים, ֶהחָצִיר, הַבְּצָלִים, הַשּׁוּמִים); ᵐ5τοὺς πέπονας.
Numbers 11:5 HEB:הַקִּשֻּׁאִ֗ים וְאֵת֙ הָֽאֲבַטִּחִ֔ים וְאֶת־ הֶחָצִ֥יר NAS: the cucumbers and the melons and the leeks KJV: the cucumbers, and the melons, and the leeks, INT: free the cucumbers and the melons and the leeks and the onions