From an unused root meaning to comminute; meal -- dough.
Englishman's Concordance
1) dough, meal, coarse meal, kneading trough 1a) meaning dubious Part of Speech: noun feminine A Related Word by BDB/Strong’s Number: from an unused root meaning to comminute Same Word by TWOT Number: 1699a
Brown-Driver-Briggs
[עֲרִיסָה] noun feminine meaning dubious, usually coarse meal; ᵐ5 AV RV dough, so Toy (with ?) (Late Hebrew עַרְסָןbarley-meal; Syriac (in Lexicons) hulled barley, or (compare LagGGN 1889, 301 f.) wheat); > SmEz CoEzkneading-trough (so Late Hebrew עֲרִיסָה Jastr; apparently secondary, עֲרִיסָה also [bed], cradle, see ערשׂ); — only רֵאשִׁית עֲרִיסֹתֵיכֶםEzekiel 44:30, עֲרִיסֹתֵינוּ׳רNehemiah 10:38; עֲרִסֹתֵיכֶם׳רNumbers 15:20,21 (P).
עַרְעָר, עַרְעֹר, עֲרֹעֵר, עֲרוֺעֵר see ערר.
I. ערף (√ of following; meaning dubious; Late Hebrew עוֺרֶף = Biblical Hebrew; Arabic mane of horse, also part of neck where hair grows, etc.).
Numbers 15:20 HEB: רֵאשִׁית֙ עֲרִסֹ֣תֵכֶ֔ם חַלָּ֖ה תָּרִ֣ימוּ NAS: Of the first of your dough you shall lift KJV: of the first of your dough [for] an heave offering: INT: of the first of your dough A cake shall lift
Numbers 15:21 HEB: מֵרֵאשִׁית֙ עֲרִסֹ֣תֵיכֶ֔ם תִּתְּנ֥וּ לַיהוָ֖ה NAS: From the first of your dough you shall give KJV: Of the first of your dough ye shall give INT: the first of your dough shall give to the LORD
Nehemiah 10:37 HEB:וְאֶת־ רֵאשִׁ֣ית עֲרִיסֹתֵ֣ינוּ וּ֠תְרוּמֹתֵינוּ וּפְרִ֨י NAS: the first of our dough, our contributions, KJV: the firstfruits of our dough, and our offerings, INT: the first of our dough our contributions the fruit
Ezekiel 44:30 HEB:יִֽהְיֶ֑ה וְרֵאשִׁ֤ית עֲרִסֽוֹתֵיכֶם֙ תִּתְּנ֣וּ לַכֹּהֵ֔ן NAS: the first of your dough to cause a blessing KJV: the first of your dough, that he may cause the blessing INT: become the first of your dough give to the priest