The story
- Latin · derived fromspigurnella
- Anglo-Norman · derived fromspigurnel
- Middle English · inherited fromspigurnel“unidentified broomlike flowering plant with medicinal uses”
- English todayspignel
Either: * an alteration of Middle English spigurnel (“unidentified broomlike flowering plant with medicinal uses”) [and other forms], borrowed from Anglo-Norman spigurnel, spigurnelle, and Anglo-Latin spigurnella, further etymology unknown; or * from spike + nail, because of the shape of its capillary leaves.
Etymology from Wiktionary, CC BY-SA 4.0.