Of uncertain derivation; the myrtle -- myrtle (tree).
H1918. hadas
הֲדַס noun masculineIsaiah 55:13 myrtle (-tree), only late (Late Hebrew, Aram id.; Arabic (in the dialect of Yemen); also , Aramaic אָסָה, ; compare LöwNo. 25) — absolute ׳ה 41:19; Nehemiah 8:15; הֲדַ֑ס Isaiah 55:13; plural הַהֲדַסִּים Zechariah 1:8 2t. (on form compare Ges§ 98, R. 4) — Isaiah 41:9 ("" אֶרֶז שִׁטָּה שָׁ֑מֶן, עֵץ בְּרוֺשׁ, תִּדְהָר, תְּאַשּׁוּר,); 55:13 ("" בְּרוֺשׁ; opposed to הַסִּרְמַֹּד), הֲדַס עֲלֵי Nehemiah 8:15 ("" עֲלֵיזַֿיִת ׳ע עֲץשֶֿׁמֶן ׳ע, תְּמָרִים ׳ע, עָבוֺת עֵץ); plural Zechariah 1:8, 10, 11.