mes·o·derm 
(mĕzə-dûrm′, mĕs-)
(mĕzə-dûrm′, mĕs-)n.
The middle embryonic germ layer, lying between the ectoderm and the endoderm, from which connective tissue, muscle, bone, and the urogenital and circulatory systems develop.
mes′o·dermal, mes′o·dermic adj.
- hemicellulose
- hemichordate
- hemicycle
- hemidemisemiquaver
- hemihedral
- hemihydrate
- hemihydrated
- hemimetabolic
- hemimetabolism
- hemimetabolous
- hemimorphic
- hemimorphite
- hemin
- Hemingway
- hemiparasite
- hemiparasitic
- hemiplegia
- hemiplegic
- hemipteran
- hemipterous
- hemisphere
- hemispheric
- hemispherical
- hemispherically
- hemistich