Fetuslike

From the descriptions of the fetuslike aliens -- known, in U.F.O. parlance, as Grays -- to the experiments they performed, the sex was nonstop: men told of anal probes and forced sperm-taking; women, artificial insemination and removal of embryos.

For the record, "Teletubbies" stars four oversized, non-gendered, fetuslike creatures named Tinky Winky, Dipsy, Laa-Laa and Po.

At the end of “2001,” Kubrick leaves us with the strange, ambiguous image of a glowing fetuslike creature floating over Earth.

Two other conditions can be confused with parasitic twins: fetus-in-fetu and mature teratoma. The first refers to a skin-covered, fetuslike abnormal mass that’s mostly inside the newborn. Mature teratomas are, instead, a type of cancer that may become malignant.