A specialized internal respiratory tube or gill structure found in certain aquatic animals.
From Greek 'entos' (within) plus 'bronchium' (a breathing tube, from 'bronchos'). This anatomical term combines Latin and Greek elements typical of scientific nomenclature.
This word is so specialized that even zoologists rarely use it—modern scientists prefer more specific anatomical descriptions. It's like finding a word that once perfectly named something, but technology made it obsolete!
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