From an unused root meaning to sting; a prickly plant -- brier, thorn.
H2312. chedeq
חֵ֑דֶק noun [masculine] brier (Late Hebrew id.; Aramaic חִדְקָא Löwp. 147, No. 104; compare Arabic a kind of night-shade, see Lane532); — כַּחֵדֶק טוֺבָם Micah 7:4 the best of them (si vera lectio) is like the brier ("" מִמְּסוּכָה יָשָׁר); חָ֑דֶק כִּמְשֻׂכַת עָצֵל דֶּרֶךְ Proverbs 15:19 the way of a sluggard is like a brier-hedge.