lowercase

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Of, printed, or formatted in lowercase letters.
• transitive verb To put (type or text) in lowercase letters.

from The Century Dictionary.

• In printing, pertaining to or belonging in the lower case (see case, n., 6): as, the lower-case boxes; lower-case type or letters. Usually abbreviated lowercase
• noun In printing, the kind of type that is placed in the boxes of the lower case (see case, 6); small letters collectively, as opposed to capitals: as, roman or italic lower-case; the title-words of this dictionary are set in condensed antique lower-case (with capital initials when these are ordinarily used).

from the GNU version of the Collaborative International Dictionary of English.

• adjective (Print.) Pertaining to, or kept in, the lower case; -- used to denote the small letters, in distinction from capitals and small capitals. Contrasted with uppercase. See the Note under 1st case, n., 3.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Alternative spelling of lower case.
• adjective in lower case

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adjective relating to small (not capitalized) letters that were kept in the lower half of a compositor's type case
• noun the characters that were once kept in bottom half of a compositor's type case