This is series of posts on interesting and unusual words and phrases.
The first set of words are adjectives that describe a shape and are often used in botany, mineralogy, and describing artistic forms.
The word for today is flagelliform: shaped like the thong of a whip, from the Latin, flagellum.
Type of spiders’ silk:

https://www.frontiersin.org/articles/10.3389/fbioe.2022.958486/full
