Medical Dictionary
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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