pars ferrea instar anuli, per quam fistulae aquae ductus coniungebantur (?)

http://lila-erc.eu/data/lexicalResources/LexiconBohemorum/id/LexicalSense/18656_GF_2 an entity of type: LexicalSense

pars ferrea instar anuli, per quam fistulae aquae ductus coniungebantur (?) 
– kruhový prstenec, kterým se spojovaly roury vodovodu (?): 
pars ferrea instar anuli, per quam fistulae aquae ductus coniungebantur (?) 
– kruhový prstenec, kterým se spojovaly roury vodovodu (?): 

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