A type of embryonic cell layer that develops from both the outer layer (ectoderm) and middle layer (mesoderm) of an embryo.
From Greek 'ekto-' (outside) + 'meso-' (middle) + 'blastos' (germ or sprout). The term combines prefixes describing embryonic tissue origin, evolving in 19th-century developmental biology.
This word shows how biologists had to invent super-specific terms to describe the tiniest stages of life—it's like naming every single ingredient in a recipe before you even know what dish you're making!
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