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
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...
There are eight major planets, but more than a million minor ones, including asteroids. If you discover one, you get the honor of naming it. The Dictionary of Minor Planet Names includes minor planets named for rock bands, jazz musicians, poets, and...