granny unit
n.— «As part of sweeping zoning changes, the city council will decide next month whether to increase the number of homesites that could add garage apartments or cottages, commonly referred to as granny or in-law units.» —“P.A. considers allowing more ‘granny’ units” by Kellie Schmitt, Dan Stober Mercury News (San Jose, California) Mar. 27, 2005. (source: Double-Tongued Dictionary)
Further reading
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There are eight major planets, but more than a million minor ones, including asteroids. If you discover one, you get the honor of naming it. The Dictionary of Minor Planet Names includes minor planets named for rock bands, jazz musicians, poets, and...