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Use "undecomposable" in a sentence
"_ -- Calcium oxide or lime has been known from a very remote period, and was for a long time considered to be an elementary or undecomposable earth."
"It seems to me that this reasoning rests on an unscientific use of the term _element_; it rests on giving to that class-name the meaning, _substances asserted to be undecomposable_."
"A line of demarcation is drawn between _elements_, meaning thereby forms of matter said to be undecomposable but probably capable of separation into unlike parts, and _true elements_, meaning thereby groups of identical undecomposable particles."