sinus rhomboidalis

noun
sinus rhom·​boi·​da·​lis | \-ˌräm-ˌbȯid-ˈā-ləs \

Medical Definition of sinus rhomboidalis 

: the posterior expanded and for a long time incompletely closed part of the neural groove of vertebrate embryos also : an expansion of the central canal in the sacral region derived from it

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