Etymology
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armadillo (n.)

burrowing mammal of the American tropics, 1570s, from Spanish armadillo, diminutive of armado "armored," from Latin armatus, past participle of armare "to arm, furnish with weapons," from arma "weapons" (including defensive armor), literally "tools, implements (of war);" see arm (n.2). So called for its hard, plated shell.

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Definitions of armadillo

armadillo (n.)
burrowing chiefly nocturnal mammal with body covered with strong horny plates;
From wordnet.princeton.edu