teras

noun
ter·​as | \ ˈter-əs How to pronounce teras (audio) \
plural terata\ ˈter-​ət-​ə How to pronounce terata (audio) \

Medical Definition of teras

: an organism (as a fetus) that is grossly abnormal in structure due to genetic or developmental causes

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to speak slightingly about or to degrade

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