TRADEMARK
hallmark, trademark, earmark, stylemark
(noun) a distinctive characteristic or attribute
trademark
(noun) a formally registered symbol identifying the manufacturer or distributor of a product
trademark
(verb) register the trademark of; “The company trademarked their new gadget”
brand, trademark, brandmark
(verb) mark with a brand or trademark; “when this product is not branded it sells for a lower price”
Source: WordNet® 3.1
Etymology
Adjective
trademark (not comparable)
(informal) distinctive, characteristic, signature
Noun
trademark (plural trademarks)
A word, symbol, or phrase used to identify a particular company's product and differentiate it from other companies' products.
Any proprietary business, product or service name.
The aspect for which someone or something is best known; a hallmark or typical characteristic.
Verb
trademark (third-person singular simple present trademarks, present participle trademarking, simple past and past participle trademarked)
To register something as a trademark.
To so label a product.
Usage notes
Among practitioners of trademark law, it is generally considered incorrect to use “trademark” as a verb; the preferred terminology would be to use a trademark or to register a trademark.
Source: Wiktionary
Trade"-mark`, n.
Definition: A peculiar distinguishing mark or device affixed by a
manufacturer or a merchant to his goods, the exclusive right of using
which is recognized by law.
Source: Webster’s Unabridged Dictionary 1913 Edition