noun, plural lagenae [luh-jee-nee] . Zoology.
an outpocketing of the saccule of birds, reptiles, and bony fishes corresponding to the cochlear duct of mammals.

< Neo-Latin, special use of Latin lagēna flask, flagon; cognate with Greek lágȳnos Unabridged
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World English Dictionary
lagena (ləˈdʒiːnə)
1.  a bottle with a narrow neck
2.  an outgrowth of the sacculus in the ear of fishes and amphibians, thought to be homologous to the cochlea of mammals
[C19: Latin, a flask, from Greek lagēnos]

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American Heritage
Medical Dictionary

lagena la·ge·na (lə-jē'nə)
n. pl. la·ge·nae (-nē)
One of the three parts of the membranous labyrinth of the inner ear of nonmammalian vertebrates.

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