- 1801 decorticates
- 1802 decorticating
- 1803 decortication
- 1804 decorticator
- 1805 decorum
- 1806 decos
- 1807 decoupage
- 1808 decoupaged
- 1809 decoupages
- 1810 decoupaging
- 1811 decouple
- 1812 decoupled
- 1813 decoupler
- 1814 decouples
- 1815 decoupling
- 1816 decoy
- 1817 decoyed
- 1818 decoyer
- 1819 decoying
- 1820 decoys
- 1821 decrassified
- 1822 decrassifies
- 1823 decrassify
- 1824 decrassifying
- 1825 decrease
- 1826 decreased
- 1827 decreases
- 1828 decreasing
- 1829 decreasingly
- 1830 decree
- 1831 decreeable
- 1832 decreed
- 1833 decreeing
- 1834 decreer
- 1835 decrees
- 1836 decreet
- 1837 decrement
- 1838 decremental
- 1839 decremented
- 1840 decrementing
- 1841 decrements
- 1842 decreolization
- 1843 decrepit
- 1844 decrepitate
- 1845 decrepitated
- 1846 decrepitates
- 1847 decrepitating
- 1848 decrepitation
- 1849 decrepitly
- 1850 decrepitness
- 1851 decrepitude
- 1852 decrescence
- 1853 decrescendi
- 1854 decrescendo
- 1855 decrescent
- 1856 decretal
- 1857 decretist
- 1858 decretive
- 1859 decretory
- 1860 decrew
- 1861 decrewed
- 1862 decrewing
- 1863 decrews
- 1864 decrial
- 1865 decried
- 1866 decrier
- 1867 decries
- 1868 decriminalisation
- 1869 decriminalise
- 1870 decriminalised
- 1871 decriminalises
- 1872 decriminalising
- 1873 decriminalization
- 1874 decriminalize
- 1875 decriminalized
- 1876 decriminalizes
- 1877 decriminalizing
- 1878 decrown
- 1879 decrowned
- 1880 decrowning
- 1881 decrowns
- 1882 decrustation
- 1883 decry
- 1884 decrying
- 1885 decrypt
- 1886 decrypted
- 1887 decrypting
- 1888 decryption
- 1889 decrypts
- 1890 dectet
- 1891 decubiti
- 1892 decubitus
- 1893 decuman
- 1894 decumbence
- 1895 decumbencies
- 1896 decumbency
- 1897 decumbent
- 1898 decumbently
- 1899 decumbiture
- 1900 decuple