meso-, mes-, mesi-

(Greek: middle, intermediate; close to a center line; between)

mesopia, mesopia vision
The ability to see in the "twilight range", between the photopic (eyes adapted to brighter light) and the scotopic vision (eyes adapted to low illumination or darkness).
mesopic, mesopic vision
A reference to the combination of photopic vision and scotopic vision in which there are low but not quite dark lighting situations.
1. The plankton living between about a hundred fathoms from the bottom and a hundred from the surface or between epiplankton and bathyplankton; alternatively, all plankton below the epiplankton level.
2. A classification of plankton of intermediate body size, between macroplanktons (large planktons) and microplanktons (very-small planktons).
Referring to the nucleus of a cell.
Any large plant floating freely between the surface and the floor of a lake.
1. An ancient region of southwest Asia between the Tigris and Euphrates rivers in modern-day Iraq.

Probably settled before 5000 B.C., the area was the home of numerous early civilizations, including Sumer, Akkad, Babylonia, and Assyria.

It diminished in importance after the Mongol invaders destroyed its extensive irrigation system in A.D. 1258.

2. Etymology: from Ancient Greek ??????????? (Mesopotamía); from ????? (mésos, "between, middle") + ??????? (potamós, "river"), because Mesopotamia is located between the Euphrates and Tigris rivers.

The geography of the area allowed for the development of husbandry, agriculture, and permanent settlements.

Trade with other regions also flourished irrigation techniques were created as well as pottery and other crafts building methods based on clay bricks were developed and elaborate religious cults evolved.

It was the two rivers that became the basis upon which the wealth of the region was based and through relatively easy irrigation, agriculture could yield heavy crops.

1. A reference to the area of Mesopotamia.
2. A native or inhabitant of Mesopotamia (the larger part of which is now Iraq).
A district between two rivers.
1. Those organisms living in, or moving between, sand.
2. Those organisms living in the interstitial (small openings, gaps, or cracks) spaces of a sandy sediment.
Prepenna following protoptile and succeeded by metaptile or by teleoptile.
mesorchium, mesorchial
1. Peritoneal fold supporting the testis in the fetus.
2. In the fetus, a fold of tunica vaginalis testis (the serous membrane surrounding the front and sides of the testicle) supporting the mesonephros and the developing testis.
3. In the adult, a fold of tunica vaginalis testis between the testis and epididymis.
Situated between the nostrils having a nasal index between 48 and 53 or the ratio of the width to the height of the nose, multiplied by 100, used in anthropological measurements.
mesorrhine, mesorhine
1. A person or skull having a nasal index intermediate between leptorrhine and platyrrhine.
2. Having a nose of moderate width.
A biological classification of water quality according to the following categories:
  • Oligosaprobic, clear, with no or only slight pollution and high dissolved oxygen.
  • Mesosaprobic, moderately polluted; polysaprobic, strongly polluted.
  • Antisaprobic, so polluted that no living organism is capable of living in the water.
1. Referring to a polluted aquatic habitat having reduced oxygen concentration and a moderately high level of organic decomposition.
2. Designating, relating to, or characteristic of running water which is partially polluted.