hollow clay tile
structural clay tile
- double features
- double feeder
- double fence intercomparison reference
- double fertilisation
- double fertilization
- double fibre glass covered
- double fifth
- double figure
- double-figure
- double figures
- double filtration plasma pheresis
- double fine action comics
- double first
- double firsts
- double fisted sailing club
- double fixed-polarity reed-muller
- double fixed pulley
- double flag
- double flap amputation
- double-flap amputation
- double flat
- double flats
- double fleece
- double flemish bond
- double float