
1) Abrupt turnoffs 2) Abutting areas 3) Australian rock music group 4) Conversational detours 5) Conversational digressions 6) Digressions 7) Divergent courses 8) Geometry lines 9) Lines that just touch 10) Male lifeguards, typically 11) Off-topic ramblings 12) Sudden digressions 13) Things to go off on
Found on
https://www.crosswordclues.com/clue/tangents
[collection] Tangents (ISBN 0-446-51401-2) is a collection of short stories by science fiction writer Greg Bear. The stories all originally appeared in a number of different publications. This collection, originally published in 1989, includes: ...
Found on
http://en.wikipedia.org/wiki/Tangents_(collection)

The straight unconvoluted portions at the end of the bellows.
Found on
http://www.pipingtech.com/products/expjtcat/expansion_joint-glossary.htm
No exact match found.