A three-dimensional surface that looks like the shape made by a hanging chain or soap film stretched between two rings.
From Latin 'catena' (chain) plus the Greek suffix '-oid' (meaning resembling), literally 'chain-like' in appearance.
A catenoid is one of only two minimal surfaces in nature (the other being a helicoid), and soap bubbles will spontaneously form catenoid shapes because they're the most efficient shape possible!
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