You searched for: “atmosteon
atmosteon (s) (noun), atmosteons (pl)
In ornithology, any ossified tube conveying air to the hollow bones in birds: Jane read in her biology book that an atmosteon pertained to an "air-bone", or a membranous tube for the scleroskeletal ossification of birds.
This entry is located in the following unit: atmo-, atm- + (page 6)