Etymology
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Words related to -derm

*der- 
Proto-Indo-European root meaning "to split, flay, peel," with derivatives referring to skin and leather.

It forms all or part of: derm; -derm; derma; dermal; dermato-; dermatology; echinoderm; epidermis; hypodermic; pachyderm; scleroderma; taxidermy; tart (adj.) "having a sharp taste;" tear (v.1) "pull apart;" tetter; turd.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit drnati "cleaves, bursts;" Greek derein "to flay;" Armenian terem "I flay;" Old Church Slavonic dera "to burst asunder;" Breton darn "piece;" Old English teran "to tear, lacerate."
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ectoderm (n.)

"outer layer of cells or outer membrane of a metazoan animal," 1853, from ecto- + -derm. Coined by Prussian embryologist Robert Remak (1815-1865). Related: Ectodermal.

endoderm (n.)
1835, from endo- + -derm. Coined by Prussian embryologist Robert Remak (1815-1865).
mesoderm (n.)

"middle germinal layer of the three-layered embryo of a metazoic animal," 1858, from French mésoderme or German Mesoderm, literally "middle skin," coined by German physician Robert Remak (1815-1865) from meso- "middle" + Greek derma "skin" (see -derm). Related: Mesodermal; mesodermic.