frond (n.)youdaoicibaDictYouDict[frond 词源字典]
1785, from Latin frons (genitive frondis) "leafy branch, green bough, foliage." Adopted by Linnæus for the leaf-like organs of ferns, palms, etc., as a word distinct from folium. Later given a more precise meaning in botany.[frond etymology, frond origin, 英语词源]