A single-celled microscopic organism that moves by extending parts of its body called pseudopodia and can cause diseases in humans.
From Greek amoibē 'change' or 'exchange,' referring to the organism's constantly changing shape. Also spelled amoeba, with the Greek diphthong ae preserved.
Amoebas are the ultimate shape-shifters—they have no fixed form, constantly morphing to move and eat, and some can split into two identical copies of themselves, making them effectively immortal through asexual reproduction.
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