Definition of rusticle in English:

rusticle

noun

  • An elongated structure often found on underwater shipwrecks, somewhat like a stalactite or icicle in appearance, consisting of microbial and fungal growths inside a layer of iron oxide.

Origin

1980s; earliest use found in Science. From rust + -icle. Coined by R. D. Ballard.

Pronunciation

rusticle

/ˈrʌstɪkl/