Home › Words › S › subsubdomainsubsubdomainsubsubdomain means A subdomain of a subdomain.Among words judged in Lexicurio's Arena, subsubdomain ranks #28,352 of 42,747 for Qualifying.EtymologyFrom sub- + subdomain.nounA subdomain of a subdomain.e.g.“Top-level domain: DE (Germany) / Internet: user@subsubdomain.subdomain.dbp.DE” — 1990, Donnalyn Frey, Rick Adams, !%@:: a Directory of Electronic Mail Addressing and Networks, O’Reilly & Associates, →ISBN, page 90:Definitions & examples from Wiktionary (CC BY-SA 3.0).