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TAKE THE QUIZAsymmetron
noun
Asym·me·tron
āˈsimə‧ˌträn
: a genus of lancelets (family Epigonichthyidae) differing from Branchiostoma in having asymmetrical metapleura and but one series of gonads, the right compare amphioxus
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Merriam-Webster unabridged
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