
1) Water stream
Found on
https://www.crosswordclues.com/clue/main-stem

`Main Stem` is 1942 instrumental by Duke Ellington and His Famous Orchestra. Although recorded in 1942, the single would not be released until 1944 where it was Duke Ellington`s last of four number one`s on the Harlem Hit Parade. `Main Stem` would also peak at number twenty on the pop chart. ...
Found on
http://en.wikipedia.org/wiki/Main_Stem

In hydrology, a main stem is `the primary downstream segment of a river, as contrasted to its tributaries`. Another common term for the main stem, the final large channel of a riverine system, is the trunk. Water enters the main stem from the river`s drainage basin, the land area through which the main stem and its tributaries flow. A drainage ......
Found on
http://en.wikipedia.org/wiki/Main_stem
No exact match found.