Etymology
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-trope 

word-forming element meaning "that which turns," from Greek tropos "a turn, direction, course, way," from PIE root *trep- "to turn."

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-ward 

adverbial suffix expressing direction, Old English -weard "toward," literally "turned toward," sometimes -weardes, with genitive singular ending of neuter adjectives, from Proto-Germanic *werda- (cognates: Old Saxon, Old Frisian -ward, Old Norse -verðr), variant of PIE *werto- "to turn, wind," from root *wer- (2) "to turn, bend." The original notion is of "turned toward."

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