The central portion of the ovarian complex of trematodes and cestodes in which fertilization takes place and the vitellarian or eggshell materials are coated over the egg; this occurs in a rapid, stamping-mill sequence, after which eggs pass into the uterus for tanning of the shell, storage, and passage toward the genital pore. [G. oon, egg, + typos, stamp, print]
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oo·type -.tīp n the part of the oviduct of most flatworms in which the eggs are furnished with a shell
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oo·type (oґo-tīp) [oo- + Gr. typos impression] in some trematodes, a dilated portion of the uterus into which the oviduct opens and where the ovum is fertilized, provided with the yolk, and invested with a shell.Medical dictionary. 2011.