elephant's toothpaste

== English == === Alternative forms === elephant toothpaste === Etymology === The foamy texture and size of the resulting mass suggest a large amount of toothpaste, as might be imagined to be used by a large creature like an elephant. === Noun === elephant's toothpaste (uncountable) A foamy substance caused by the rapid decomposition of hydrogen peroxide using potassium iodide as a catalyst; the outcome of a popular educational experiment in chemistry.