Definitions

1. noun

A person who is a member of a family or clan bearing the name Osnager, or a variant of Osenger.

“He was a direct descendant of a 17th-century Osnager.”

2. noun

A person who is a researcher in the field of thermodynamics, particularly one who has worked on the Onsager reciprocal relations.

“The renowned scientist was an expert in the field of thermodynamics and was known as an Onsager.”