rusticle
n.— «Although iron bacteria are of primary importance in extracting the iron that forms the rusticle, the rusticles are composed of a community of perhaps dozens of microbial species.» —“Recent excitement about the Archaea” by Ken F. Jarrell, Douglas P. Bayley, Jason D. Correia, Nikhil A. Thomas BioScience July 1, 1999. (source: Double-Tongued Dictionary)
Further reading
What if, instead of being an inanimate object, a dictionary were alive? That’s the idea behind a lavishly illustrated new children’s book called The Dictionary Story (Bookshop|Amazon) by Oliver Jeffers and Sam Winston. This is part of a...
Cat hair may be something you brush off, but cat hair is also a slang term that means “money.” In the same way, cat beer isn’t alcoholic — some people use cat beer as a joking term for “milk.” And imagine walking on a...