字爿 (Jī-pêng)是 (sī)指 (chí)一个 (chi̍t-ê)漢字 (Hàn-jī)組成 (cho͘-sêng)的 (ê)一 (chi̍t)部分 (pō͘-hūn)筆畫 (pit-oē),其中 (kî-tiong)有 (ū)部份 (pō͘-hūn)嘛 (mā)是傳統 (thoân-thóng)歸納 (kui-la̍p)的部首 (pō͘-siú) (部首),總是 (chóng-sī)仝 (kâng)一个部首,做 (chò)字爿的時 (sî)有可能 (khó-lêng)通 (thang)分 (hun)濟 (chē)種 (chióng)無 (bô)仝形款 (hêng-khoán)。