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European hawthorn having deeply cleft leaves and bright red fruits; widely cultivated in many varieties and often grown as impenetrable hedges; established as an escape in eastern North America Crataegus monogyna , English hawthorn
quality of being impenetrable (by people or light or missiles etc.) impenetrability , imperviousness
impenetrable barrier to communication or information especially as imposed by rigid censorship and secrecy; used by Winston Churchill in 1946 to describe the demarcation between democratic and communist countries iron curtain
impenetrable equatorial forest jungle
tropical tree or shrub bearing fruit that germinates while still on the tree and having numerous prop roots that eventually form an impenetrable mass and are important in land building mangrove , Rhizophora mangle
small evergreen shrub or tree of southeastern United States; often forms almost impenetrable thickets in sandy coastal areas myrtle oak , Quercus myrtifolia , seaside scrub oak
radiation, impenetrable by certain types of opaque
impenetrable box locked to secure items safe
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