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United States electrical engineer noted for his work on the theory of alternating currents; independently of Oliver Heaviside he discovered the existence of an atmospheric layer that reflects radio waves back to earth (1861-1939) A. E. Kennelly , Arthur Edwin Kennelly , Kennelly
disavowal or taking back of a previous assertion abjuration , recantation , retraction
hold back from doing something abstain , refrain
interior door that opens by folding back in sections (rather than by swinging on hinges) accordion door , folding door
European hawkmoth with markings on the back resembling a human skull Acherontia atropos , death's-head moth
modem that converts electrical signals to telephone tones and back again acoustic modem
inflamed tissue mass at the back of the pharynx adenoid
ray with back covered with white or yellow spots; widely distributed in warm seas Aetobatus narinari , spotted eagle ray , spotted ray
common savannah monkey with greenish-grey back and yellow tail African green monkey , Cercopithecus aethiops sabaeus , green monkey
United States writer and Afro-American who wrote a fictionalized account of tracing his family roots back to Africa (1921-1992) Alex Haley , Haley
river that rises in Pennsylvania and flows north into New York and then back south through Pennsylvania again to join the Monongahela River at Pittsburgh which is the beginning of the Ohio River Allegheny , Allegheny River
large species having three ridges on its back; found in southeastern United States alligator snapper , alligator snapping turtle , Macroclemys temmincki
change repeatedly back and forth alternate , fluctuate , oscillate , vacillate
successive change from one thing or state to another and back again alternation
back-and-forth movement alternation , reciprocation
fish with a dark-blue back and whitish sides with red stripes; found in swamps and streams of Florida American flagfish , flagfish , Jordanella floridae
partly inverted ovule turned back 90 degrees on its stalk amphitropous ovule
completely inverted ovule turned back 180 degrees on its stalk anatropous ovule
having the back covered with thick bony plates; thought to have walked with a sprawling gait resembling a lizard's ankylosaur , ankylosaurus
3rd syllable of a word counting back from the end antepenult , antepenultima , antepenultimate
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