<zoology> The second lateral plate in the plastron of turtles. ... Synonym: hyosternum. ... Origin: Hyo- + plastron. ... (01 Mar 1998) ... Found on http://www.encyclo.co.uk/local/20973
Hy`o·pas'tron noun [ Hyo- + plastron .] (Zoology) The second lateral plate in the plastron of turtles; -- called also hyosternum . Found on http://www.encyclo.co.uk/webster/H/80