lower-case
小寫
low·er·case, Low·er-case a. Print. Pertaining to, or kept in, the lower case; -- used to denote the small letters, in distinction from capitals and small capitals; as, lowercase letters a and b and c etc.. Contrasted with uppercase. See the Note under 1st Case, n., 3.
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lowercase
adj : relating to small (not capitalized) letters that were kept
in the lower half of a compositor's type case;
"lowercase letters; a and b and c etc" [ant: uppercase]