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Diego Garcia
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dielectric constant
dielectric heating
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Diels-Alder reaction
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diencephalon
di·en·ceph·a·lon [ d en séffə lòn ] (plural di·en·ceph·a·lons)


noun 
Definition:
 
part of brain: the area in the center of the brain just above the brain stem that includes the thalamus and hypothalamus
[Late 19th century. <dia- + Greek enkephalos "brain"]

di·en·ce·phal·ic [ d enssə fállik ] adjective
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