Where does “whatsit” come from?

whatsit (English) comes from English what, from Middle English what, from Old English hwæt, from Old English -ing, from Old English -tūn, from Old English tūn, from Proto-West Germanic tūn, from Proto-Germanic tūną — smoke; mist, haze.

whatsit (English): A thing (used in a vague way to refer to something whose name one cannot recall, or that one is embarrassed to say)

Definitions

  1. A thing (used in a vague way to refer to something whose name one cannot recall, or that one is embarrassed to say)

Ancestry of “whatsit”, step by step

whatsit traces back through 3 separate lines of ancestry.

via English what

StepLanguageWordMeaning
1EnglishwhatWhich thing, event, circumstance, etc.: used...
2Middle Englishwhatwhat
3Old Englishhwætwhat; why; how many or how much
4Old English-ingForming nouns from verbs, indicating action,...
5Old English-tūnhomestead, village, town
6Old Englishtūnenclosure, yard; place; dwelling
7Proto-West Germanictūnfence
8Proto-Germanictūnąfence; enclosure
9Gaulishdunumfort; hill, hillfort
10Proto-Celticdūnomstronghold, rampart
11Proto-Indo-Europeandʰewh₂-smoke; mist, haze

via English IS

StepLanguageWordMeaning
1EnglishISInitialism of International Sign; Initialism of...
2Middle Englishisice; That which is short-lived like ice; icy...
3Old Englishīsice
4Proto-West Germanicīsice
5Proto-Germanicīsąice
6Proto-Indo-Europeanh₁eyH-ice, frost

via English IT

StepLanguageWordMeaning
1EnglishITInitialism of information technology; Initialism...
2Middle EnglishitAlternative form of hit
3Old Englishhitit
4Proto-Germanichitnominative/accusative singular neuter of *hiz
5Proto-Indo-Europeanḱe-demonstrative particle; here; this, here
Every word from Proto-Indo-European dʰewh₂-Every word from Proto-Celtic dūnomEvery word from Gaulish dunum