From an unused root apparently meaning to be thick; the thumb of the hand or great toe of the foot -- thumb, great toe.
H931. bohen
בֹּ֫הֶן noun [feminine] (compare Sta§ 310 c) with יַד thumb, with רֶגֶל great toe (Arabic , & (vulgar) , ) — ׳בּ only construct Exodus 29:20 (twice in verse) + 12t.; plural construct בְּהֹנוֺת Judges 1:6-7, (from singular [בְּהוֺן] as always Manuscript ⅏ for בֹּהֶן ᵑ0); — thumb (יָדָם) ׳בּ יָדוֺ, & great toe (דַגְלָם) ׳בּ רַגְלוֺ (always named together) Exodus 29:20 (twice in verse); Leviticus 8:23 (twice in verse); 8:24 (twice in verse); 14:14 (twice in verse); 14:17 (twice in verse); 14:25 (twice in verse); 14:28 (twice in verse); י ׳בְּהֹנוֺת ׳וְר Judges 1:6-7,.