(printing, historical) A shallow tray divided into compartments or "boxes" for holding type, traditionally arranged in sets of two, the "upper case" (containing capitals, small capitals, accented) and "lower case" (small letters, figures, punctuation marks, quadrats, and spaces).
(typography, by extension) The nature of a piece of alphabetic type, whether a “capital” (upper case) or “small” (lower case) letter.
“I carefully examined the jewelry casing to ensure that the precious gemstones were securely enclosed within.”
casebook
A collection of stories or accounts that can individually be described as cases.
(law) A kind of book, used predominantly in United States law schools, containing the text of court opinions in legal cases accompanied by analysis and related materials.