I. -ˌmärk noun
Date: 1838
1. : a device (as a word) pointing distinctly to the origin or ownership of merchandise to which it is applied and legally reserved to the exclusive use of the owner as maker or seller
2. : a distinguishing characteristic or feature firmly associated with a person or thing
derringers…became almost a trademark of gamblers — Elmer Keith
wearing his trademark bow tie and derby hat
II. transitive verb
Date: 1906
: to secure trademark rights for : register the trademark of