MesoproterozoicOf a geologic era within the Proterozoic eon; comprises the Calymmian, Ectasian and Stennian periods from about 1600 to 900 million years ago, when the Rodinia supercontinent was formed.
mesorchiumThe fold of peritoneum that attaches the testis to the dorsal wall of the body cavity or scrotum.
MesoreThe twelfth and last month of the later ancient Egyptian civil calendar and Coptic calendar, corresponding to the fourth and last month of the season of Shemu. Since 25 BCE, when the calendar was reformed to include leap-days, Mesore has been in roughly August.
mesorectalOf or pertaining to the middle part of the rectum
mesorectumThe fold of peritoneum, or mesentery, attached to the rectum.
mesoregionAn administrative area in Brazil comprising a group of municipalities
mesoreliefA relief that is intermediate in scale between microrelief and macrorelief.
mesorhineHaving a medium-width nose, between leptorhine and platyrhine.
mesosalineOf a body of water, of intermediate salinity.
mesosalpinxPart of the lining of the abdominal cavity in higher vertebrates, specifically the portion of the broad ligament that stretches from the ovary to the level of the uterine tube.
mesosaurAny of a group of small aquatic reptiles, from the early Permian period, of the order †Mesosauria.
mesosauridAny extinct reptile in the family Mesosauridae; a mesosaur.
mesoscaleOf medium size or extent; between microscale and macroscale.
mesoscapheA submersible submarine designed for drifting on sea currents in the middle depth layers of the ocean.
mesoscapulaA process from the middle of the scapula in some animals; the spine of the scapula.
mesosomaThe middle part of the body, or tagma, of arthropods whose body is composed of three parts (the other two being the prosoma and the metasoma), bearing the legs and (in winged insects) the wings.
mesosomeA folded invagination in the plasma membrane of bacteria, produced by the chemical fixation techniques used to prepare samples for electron microscopy, but previously thought to be part of the normal structure of the cell.
mesospermalegePart of the spermalege, derived from the mesoderm; it is a membrane-bound sac attached to the wall of the haemocoel, directly beneath the groove of the ectospermalege.
mesostasisThe very last state (or material formed) in the formation of an igneous rock
mesostateAn intermediate physical state of matter between solid and liquid, in which the molecules have more freedom of movement than when locked in a crystal lattice, but less freedom of movement than when in the liquid state.
mesosuchianAny of the informal group †Mesosuchia of terrestrial, semi-aquatic, or fully aquatic crocodylomorph reptiles, previously thought to be true cocodiles.
mesotetraploidThat has become tetraploid in more recent history
mesothecaThe middle layer of the gonophore in the Hydrozoa.
mesotheciumThe intermediate layer of cells in the wall of the anther, in ripe anthers often occurring as the inner layer by disappearance of the endothecium proper.
mesotheleAny of the suborder Mesothelae of spiders, with one extant family.
mesothelinA protein found in mesothelial cells and overexpressed in several human tumors.
mesotheliomaAn uncommon malignant tumour of the mesothelium, usually of the lungs after exposure to asbestos.
mesotheliumA membrane of flat epithelial cells that lines the body cavity of embryos and forms the squamous cells of the peritoneum, pericardium, and pleura
mesothelizationThe formation and development of the mesothelium
mesotherapyAny treatment that involves the injection of vitamins or other substances into the mesoderm of the skin
mesothereAny extinct notoungulate of the genus †Mesotherium
mesotheriidAny extinct mammal in the family Mesotheriidae.
mesothermAn animal that adjusts its body to a metabolically favourable temperature using a context-dependent balance of internal metabolically-produced heat and external-environmentally derived heat.
mesoventriteA projecting part of the ventral thorax between the mid pair of legs of beetles.
mesovoidA small underground cavity, ranging in size from a few millimeters to several centimeters, formed in fragmented rock or stony soils.
mesovortexA small-scale, vertical vortex of air associated with a thunderstorm that occurs at less than one kilometer from the ground and is between 2-20 kilometers in width.
mesowearA method of determining the lifelong diet of a taxon.