breathlessness or shorthess of breath; labored or difficult breathing. It is a sign of a variety of disorders and is primarily an indication of inadequate ventilation or of insufficient amounts of oxygen in the circulating blood. adj., adj dyspneÂ´ic.
CMD may refer to: 1  CMD is commonly used to mean command: 2  CMD.EXE (Command Prompt), the command-line interpreter on Windows operating systems.  Command (computing), an abbreviation commonly used in computing.
File descriptor. In Unix and related computer operating systems, a file descriptor (FD, less frequently fildes) is an abstract indicator (handle) used to access a file or other input/output resource, such as a pipe or network socket. File descriptors form part of the POSIX application programming interface.