wŏchə-mə-kôlĭt, wŭch-, hwŏch-, hwŭch-
Something whose name is unknown or forgotten.
Webster's New World
A metasyntactic term used for any object whose actual name you don't know or can't remember. There are many spellings and many synonyms.
Other Word Forms of Whatchamacallit
Origin of Whatchamacallit
Shortened version of "what you may call it" or "what you might call it".
Alteration of what you may call it
From American Heritage Dictionary of the English Language, 5th Edition
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Words Starting With W and Ending With T