MES- 



185 



MES- 



mesometrium (mes'ome'trium) n. 

 [Gk. mesos, middle ; metra, uterus.] 

 The mesentery of uterus and con- 

 necting tubes (anat.). 

 mesomitosis (mes'omito'sis) n. [Gk. 

 mesos, middle ; mttos, thread.] 

 Mitosis within the nuclear mem- 

 brane, without co-operation of cyto- 

 plasmic elements ; cf. metamltosis 

 (emb.). 



mesomyodian (mes'dmlo'dlan) a. [Gk. 

 mesos, middle ; ntys, a muscle.] 

 Appl. birds with muscles of syrinx 

 attached to middle of bronchial 

 semi-rings (zoo/.}. 



meson (mes'8n, mez^n) n. [Gk. mesos, 

 middle.] The central plane, or 

 region of it (zool.). 



mesonephric (mes'oneTrik) a. [Gk. 

 mesos, middle ; nephros, kidney.] 

 Pert, mesonephros, or mid-kidney; 

 appl. duct, tubules (zool.). 

 mesonephridium (mes'one'frfd'ium) n. 

 [Gk. mesos, middle; nephros, kidney.] 

 A nephridium or excretory organ 

 of certain invertebrates, derived 

 from mesoblast (zool.). 

 mesonephros (mes'6neTr5s) n. [Gk. 

 mesos, middle ; nephros, kidney.] 

 The intermediate part of the ex- 

 cretory organ in vertebrate embryos 

 it becomes the functional kidney 

 in lower Craniata, it atrophies 

 in the higher forms (zoo/.) ; the 

 Wolffian body (anat.). 

 mesonotum (mes'ono'tum) n. [Gk. 

 mesos, middle ; noton, the back.] 

 The dorsal part of an insect meso- 

 thorax (zool.). 



mesoparapteron (mes'6'parap'tSron) n. 

 [Gk. mesos, middle ; para, beside ; 

 pteron, wing.] The small sclerite 

 of the mesothorax of insects (zool.). 

 mesopetalum (mes'opfit'alum) n. [Gk. 

 mesos, middle ; petalon, a petal.] 

 The labellum or lip of an orchid 

 (bot.). 



mesophragma (mes'ofrag'ma) n. [Gk. 



mesos, middle ; phragma, a fence.] 



A chitinous piece descending into 



interior of insect body with post- 



scutellum for base (zool.). 



mesophryon (mesofrion) n. [Gk. 



mesos, middle ; ophrys, an eyebrow.] 



The elevated median head-region 



of Trilobites (Pal.). 



raesophyll (mes ofil) n. [Gk. mesos, 



middle ; phyllon, leaf.] The inter- 

 nal parenchyma of a leaf (bot.). 

 mesophyte (mes'oflt) n. [Gk. mesos, 

 middle ; phyton, plant.] A plant 

 thriving in temperate climates with 

 a normal amount of moisture (bot.). 

 mesoplankton (mes'6plang'kt6n) n. 

 [Gk. mesos, middle ; plangktos, 

 wandering.] Floating animal and 

 plant life from a hundred fathoms 

 downwards.^ 



mesoplast (mes'oplast) n. [Gk. mesos, 

 middle ; plastos, moulded.] A cell 

 nucleus (cyt.). 



mesoplastron (mes'6plas'tr5n) n. [Gk. 

 mesos, middle ; F. plastron, breast- 

 plate.] A plate between hyo- and 

 hypo - plastron of certain Turtles 

 (zool.). 



mesopleuron (mes'oploo'rSn) . [Gk. 

 mesos, middle ; gleura, side.] A 

 lateral part of an insect mesothorax 

 (zool.). 



mesopodlal (mes'opo'dlal) a. [Gk. 

 mesos, middle ; pous, foot.] Pert. 

 a mesopodium (bot., zool.). 

 mesopodium (mes'opo'dlum) n. [Gk. 

 mesos, middle ; pous, foot.] The 

 leaf-stalk or petiole region of a leaf 

 (bot.) ; the middle part of a mol- 

 luscan foot (zool.). 



mesopraescutum (mes'opresku'tum) 

 n. [Gk. mesos, middle ; L. prae, 

 before ; scutum, a shield.] The 

 praescutum of mesothorax in Insects 

 (zool.). 



mesopterygium (mes'6pt6rij'Ium) n. 

 [Gk. mesos, middle ; pterygion, a 

 little wing or fin.] The middle of 

 three basal pectoral fin-cartilages 

 in recent Elasmobranchs (zool.). 

 mesopterygoid (mes'5pt6rTgoid) n. 

 [Gk. mesos, middle ;pteryx, a wing ; 

 eidos, resemblance.] The middle 

 of three pterygoid bone elements of 

 Teleosts ; the ectopterygoid (zool.). 

 mesorchium (mes&r'klum) n. [Gk. 

 mesos, middle ; orchis, a testicle.] 

 The mesentery supporting the 

 testis, attached to dorsal abdominal 

 wall in mammalian embryos ; sus- 

 pensory in adult Fishes (zool.). 

 mesorectum (mes'b'rgk'tum) n. [Gk. 

 mesos, middle ; L. rectus, straight.] 

 The mesentery supporting the 

 rectum (anat.). 

 mesorhlnal (mes'ori'nal) a. [Gk. 



