THRENETIC
[adjective]
pertaining to a threne; sorrowful; mournful; lamentation.
Etymology: from Greek thrēnos (dirge).
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PORPHYROGENITIC
[adjective]
of royal birth.
Etymology: from Greek porphyrogénnētos, literally “born in the purple”.
DERF
[adjective]
Scottish: bold; daring.
Etymology: from Middle English, of Scandinavian origin; akin to Old Norse djarfr, “bold”; akin to Old English deorfan, “to labour, perish”, Old Saxon derƀi, “strong”, Old Frisian derve, “bold”, Armenian derbuk, “rough, stiff”, Lithuanian dìrbti, “to work”.
CRYSTALLOMANIA
[noun]
an obsession with crystals and other crystalline objects.
Etymology: from Old English cristal, “clear ice/mineral”, from Latin crystallum, “crystal, ice”, later reinforced from Anglo-Norman cristall, Middle French cristal, from Latin crystallum, from Ancient Greek κρύσταλλος (krústallos, “clear ice”), from κρύος (krúos, “frost”), from the Proto-Indo-European *krus-, *kru-, “hard, hard outer surface, crust”.
The Doctor Is Out 