in-law 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
What if, instead of being an inanimate object, a dictionary were alive? That’s the idea behind a lavishly illustrated new children’s book called The Dictionary Story (Bookshop|Amazon) by Oliver Jeffers and Sam Winston. This is part of a...
Mary Beth in Greenville, South Carolina, wonders: Why do we say four-oh-nine for the number 409 instead of four-zero-nine or four-aught-nine? What are the rules for saying either zero or oh or aught or ought to indicate that arithmetical symbol...