PTSot 21.d:24[2] :עובייה דהן גבי קוטנה דההן‏ : the thick part of this (beam) is next to the thin part of the other
See the entire entry for *ˁŏḇī, ˁuḇyā n.m. thickness

PTSot 21.d:24[2] :ועוביה דהן גבי קוטנה דההן‏ : the thick part of that (fish) is next to the thin part of the other
See the entire entry for qṭon, quṭnā n.m. tail; masses