MES- 



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MES- 



wind-pipe.] In birds, the main 

 trunk of a bronchus in the lung 

 beyond the ventricle : it gives rise 

 to secondary bronchi (zoo/.). 



mesocaecum (mes'ose'kum) n. [Gk. 

 mesos, middle ; L. caecus, blind.] 

 The mesentery connected with the 

 caecum (anat.). 



mesocardium (mes'okar'dlum) n. [Gk. 

 mesos, middle ; kardia, the heart.] 



- An embryonic mesentery binding 

 the heart to the pericardial walls 

 (emb.); part of the pericardium 

 enclosing veins (venous m.) or 

 aorta (arterial m.) (anat.). 



mesocarp (mes'okarp) n. [Gk. mesos, 

 middle ; karpos, fruit.] The middle 

 layer of the pericarp or coat of a 

 fruit (bot.). 



mesocentrous (mes'ose'n'trus)tf. [Gk. 

 mesos, middle ; L. centrum, a centre.] 

 Ossifying from a median centre 

 (anat.). 



mesochilium (mes'okil'ium) n. [Gk. 

 mesos, middle ; cheilos, a lip.] The 

 middle portion of the labellum of 

 orchids (bot.). 



mesocoel (mes'osel) n. [Gk. mesos, 

 middle ; koilos, hollow.] The second 

 of three main parts of the coelom 

 of Molluscs (zoo/.). 



mesocolic (mes'okol'ik) a. [Gk. mesos, 

 middle ; kolon, the large intestine.] 

 Pert, the mesocolon ; appl. lymph 

 glands (anat.). 



mesocolon (mes'oko'lon) n. [Gk. 

 mesos, middle ; kolon, the large in- 

 testine.] A mesentery or fold of 

 peritoneum attaching the colon to 

 the dorsal wall of the abdomen 

 (anat.). 



mesocoracoid (mes'okor'akoid) a. [Gk. 

 mesos, middle ; korax, crow ; eidos, 

 resemblance.] Situated between 

 hyper- and hypo-coracoid ; appl. 

 a middle part of the coracoid arch 

 of certain Fishes (zoo/.). 



mesocycle (mes'oslkl) n. [Gk. mesos, 

 middle ; kyklos, a circle.] A layer of 

 tissue between xylem and phloem 

 of a monostelic stem ; part of the 

 conjunctive tissue of the stele (hot.). 



mesoderm (mes'odgrm) n. [Gk. mesos, 

 middle ; derma, skin.] The meso- 

 blast or embryonic layer lying be- 

 tween the ectoderm and endoderm 

 (emb.). 



mesodermal (mes'oder'mal) a. [Gk. 

 mesos, middle ; derma, skin.] Pert. 

 derived or developing from meso- 

 derm (emb.). 



mesodesm (mes'odezm) n. [Gk. mesos, 

 middle ; desma, bond.] Part of the 

 mesocycle (bot.). 



mesodont (mes'6d8nt) a. [Gk. mesos, 

 middle ; odous, tooth.] Appl. stag- 

 beetles having a medium develop- 

 ment of mandible projections (zoo/.). 



mesogaster (mes'ogas'te'r) n. [Gk. 

 mesos, middle ; gaster, belly.] The 

 mesentery proper, or fold of peri- 

 toneum supporting the stomach 

 (anat.). 



mesogastric (mes'ogas'trik) a. [Gk. 

 mesos. middle ; gaster, belly.] Pert. 

 a mesogaster or mesogastrium ; 

 pert, the middle gastric region 

 (anat.). 



mesogastrium (mes'ogas'trium) n. 

 [Gk. mesos, middle ; gaster, belly.] 

 The mesentery connecting stomach 

 with dorsal abdominal wall in the 

 embryo (emb.) ; the middle ab- 

 dominal region (anat.). 



mesogloea (mes'ogle'a) n. [Gk. mesos, 

 middle ; gloia, glue.] An inter- 

 mediate non-cellular layer in 

 Sponges and Coelenterates (zoo/.). 



mesognathion (mes'ognath'ion) n. 

 [Gk. mesos, middle ; gnathos, jaw.] 

 The lateral segment of the maxilla, 

 bearing the lateral incisor (anat.). 



mesohepar (mes'ohe'par) n. [Gk. 

 mesos, middle ; L. hepar, liver.] The 

 mesentery supporting the liver 

 (anat.). 



mesohydpophytic (mes'ohl'droflt'ik) 

 a. [Gk. mesos, middle ; hydor, 

 water ; phyton, plant.] Growing in 

 temperate regions but requiring 

 much moisture (bot.). 



mesolecithal (mes'oleVlthal) a. [Gk. 

 mesos, middle ; lekithos, yolk of 

 egg.] Appl. eggs with yolk in the 

 centre (emb). 



mesology (mes81'ojT) n. [Gk. mesos, 

 middle ; logos, discourse.] Bio- 

 nomics ; the relation between or- 

 ganism and environment. 



mesomere (mes'omer) n. [Gk. mesos, 

 middle ; meros, part.] The middle 

 zone of the coelomic pouches in 

 the embryo ; a mesoblastic somite 

 or protovertebra (emb.). 



