資料來源 : Webster's Revised Unabridged Dictionary (1913)

Metadiscoidal \Met`a*dis*coid"al\, a. [Meta- + discoidal.]
   (Anat.)
   Discoidal by derivation; -- applied especially to the
   placenta of man and apes, because it is supposed to have been
   derived from a diffused placenta.