An organism or substance that lacks a definite form or shape.
From Greek a- (without) + morphe (form, shape). This scientific term developed in the 19th century to describe things that don't fit neat biological categories.
Amoebas are nature's ultimate shapeshifters—they're literally called 'amorphs' because they refuse to stay one shape, and scientists needed a special word to describe these rebels that didn't fit the usual rules of what an organism should look like.
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