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(1) See functional dependency.

(2) (Floppy Disk) For example, FD/HD refers to a computer with a floppy disk and hard disk. See floppy disk.

(2) (1) The hexadecimal equivalent of 254 in decimal or 11111101 in binary. See hex and hex chart.

floor drain

typical floor drains
A fixture providing an opening in a floor to drain water into a plumbing system; in homes, usually fitted with a deep seal trap.