þaðer
þaðer is a hypothetical linguistic term used in discussions of Scandinavian languages and constructed-language grammars. It denotes a fused form derived from the Icelandic demonstrative pronoun það (that/it) and the copular verb er (is). The form is not attested in natural-language corpora; it appears in thought experiments and conlang grammars as a device to explore what happens when a demonstrative and the copula merge in a single analytic unit.
Origin and status: The term þaðer is not part of standard Icelandic or other Nordic grammars. It
Grammatical function: In proposed models, þaðer can function as a sentence-initial marker that introduces a definitional
Illustrative usage: Example (illustrative, not attested): “þaðer er gott,” meaning “that is good.” Another constructed sentence
See also: Icelandic language, copula, demonstratives, grammatical fusion, conlangs.