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first messenger

noun Biochemistry.

a hormone that triggers a biochemical reaction at a site removed from its release.

Compare second messenger.

Origin:
1975–80

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Based on the Random House Dictionary, © Random House, Inc. 2012.
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First messenger is always a great word to know.

So is beryllium. Does it mean:

Symbol: Be; atomic weight: 9.0122; atomic number: 4

Symbol: Te; atomic weight: 127.60; atomic number: 52

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"In the one instance, the dreamer ... loses sight of this object in a wilderness of deductions and suggestions ... until ... he finds the incitamentum, or first cause of his musings,... forgotten. In my case, the primary object was invariably frivolous, although assuming, through the medium of my distempered vision, a refracted and unreal importance."

-Edgar Allan Poe

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