Columellar

col;u;mel;la pronunciation: function: noun inflected form(s): plural col;u;mel;lae etymology: new latin, from latin, diminutive of columnadate: circa 1755 1 : the central column or axis of a spiral univalve shell2 a : the bony or partly cartilaginous rod connecting the tympanic membrane with the internal ear in birds and in many reptiles and amphibians b : the bony central axis of the cochlea— col;u;mel;lar adjective