dehiscence (en)

(noun) when a seed vessel or a wound gapes or bursts open

fuliginous (en)

(adjective) sooty / (adjective) obscure murky / (adjective) having a dark or dusky color

helots (en)

a subjugated population group that formed the main population of Laconia and Messenia, the territory controlled by Sparta (in Ancient Greece)

karstic (en)

(noun) an irregular limestone region with sinkholes, underground streams, and caverns