In cestodes and trematodes, a common chamber receiving vitelline (yolk) material from the two vitelline ducts; the yolk material then passes into the ootype to surround the ovum with nutritive vitelline granules that are enclosed by a characteristically formed eggshell. SYN: vitelline reservoir.
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vi·tel·lar·i·um .vīt-əl-'ar-ē-əm n, pl -lar·ia -ē-ə a modified part of the ovary that in many flatworms and rotifers produces yolk-filled cells serving to nourish the true eggs
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vi·tel·la·ri·um (vi″tə-larґe-əm) an accessory genital gland found in flukes and tapeworms which secretes the yolk and shell for the fertilized egg; called also vitelline gland.Medical dictionary. 2011.