cell theory

noun
a basic tenet of modern biology, first stated by Matthias Schleiden and Theodor Schwann in 1838–39, that cells are the basic units of structure and function in living organisms.
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cell theory

noun
(biology) the theory that cells form the fundamental structural and functional units of all living organisms; proposed in 1838 by Matthias Schleiden and by Theodor Schwann 
WordNet® 3.0, © 2006 by Princeton University.
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00:10
Cell theory is always a great word to know.
So is ort. Does it mean:
a scrap or morsel of food left at a meal.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
Example sentences
The cancer-stem-cell theory, though plausible, was based on animal experiments and its relevance to humans was untested.
One will be referred to as the convention cell theory and the other as the residual salinity theory.
Solar cell theory, cell manufacturing and how they are modeled mathematically are described.
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