noun
emanation
em-uh-NAY-shun/ˌeməˈneɪʃn/
Something that flows or arises from a source.
The lantern's warm emanation of light spreads into the surrounding darkness.

Etymology
The “flow out” image became a noun for both the process and what it produces. In this sense, an emanation is the thing that issues or is given off from a source.
In context
the emanation from radium is steady and constant, whereas the X-ray at best varies slightly with changing conditions of the current and vacuum in the X-ray tube.
More examples
- The vents carry gaseous emanations away from the laboratory.
- She sees the poem as an emanation of his grief.
- The instrument detects faint emanations from the radioactive sample.
Forms
emanation · emanations
emanate verb — To flow or arise from a source.
Similar words
- emission
- Usually something released physically, especially gas, heat, or radiation.
- outflow
- Emphasizes outward movement, often of liquids or money.