| blastocyst | In mammalian development, cleavage produces a thin walled hollow sphere, whose wall is the trophoblast, with the embryo proper being represented by a mass of cells at one side. The blastocyst is formed before implantation and is equivalent to the blastula. (18 Nov 1997) |
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| trilaminar | Having three laminae. (05 Mar 2000) |
| trilaminar blastoderm | The blastoderm after all three of the primary germ layers have been established. (05 Mar 2000) |
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