The source of a river, information, goods, etc.
The proximal end of attachment of a muscle to a bone that will not be moved by the action of that muscle.
An arbitrary point on Earth's surface, chosen as the zero for a system of coordinates.
The beginning of something.
Ancestry.
The point at which the axes of a coordinate system intersect.
The person, place, or thing from which something (information, goods, etc.) comes or is acquired.
A reporter's informant.
Source code.
The name of one terminal of a field effect transistor (FET).
Spring; fountainhead; wellhead; any collection of water on or under the surface of the ground in which a stream originates.
To obtain or procure: used especially of a business resource.
To find information about (a quotation)'s source (from which it comes): to find a citation for.