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Medical Definition of Ixodes
: a widespread genus of ixodid ticks comprising chiefly bloodsucking parasites of humans and animals that may transmit pathogenic microorganisms and including one (I. holocyclus) of Australia that is known to cause severe allergic reactions — see castor-bean tick, deer tick, brown dog tick, western black-legged tick
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Merriam-Webster unabridgedWords at Play
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