myelacephalus

myelacephalus

[mī′əlāsef′ələs]
Etymology: Gk, myelos, marrow, a + kephale, without head
a fetus, usually a separate monozygotic twin, whose form and parts are barely recognizable; a slightly differentiated amorphous mass. myelacephalous, adj.
References in periodicals archive ?
There are types like myelacephalus, acephalus and amorphus.