third-level domain
a.k.a. subdomain In the Domain Name System (DNS) hierarchy, it's the highest level underneath the second-level domains. It is that portion of the domain name that appears two segments to the left of the top-level domain; for example, the "products" in http://products.netlingo.com. (Note: Third level domains are not the portion of an e-mail address that appears in front of the @ symbol.)
NetLingo Classification: Technical Terms
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