triatomicadj.
/trʌɪəˈtɒmɪk/ Chemistry.
(a) Having three atoms in the molecule. †(b) = trivalent adj. Obsolete. (c) Containing three hydroxyl groups (OH); = trihydric adj.1
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the world > matter > chemistry > valency > [adjective] > having a valency of three
triatomic1862
tribasic1862
ter-equivalent1866
trivalent1868
tervalent1869
triadic1882
the world > matter > chemistry > atomic chemistry > [adjective] > relating to molecules > by number of atoms
monatomic1848
pentatomic1858
ter-atomic1861
tetratomic1862
triatomic1862
diatomic1866
hexatomic1868
octatomic1875
heptatomic1886
monadic1907
the world > matter > chemistry > organic chemistry > organic groups > [adjective] > hydroxyl groups > containing 3 hydroxyl groups
triatomic1862
trihydric1866
trihydroxy1895
1862 W. A. Miller Elements Chem. (ed. 2) III. 53 To the triatomic group [of elements] belong nitrogen, phosphorus, arsenic, antimony, bismuth, and gold.
1863–72 H. Watts Dict. Chem. I. 464 To classify them [primary hydrides and chlorides] in four principal groups, thus: Monatomic, Diatomic, Triatomic, Tetratomic.
1866 H. E. Roscoe Lessons Elem. Chem. xxxvi. 315 The possible number of derivatives of the triatomic alcohols is much larger than that of either of the preceding classes.
1872 H. Watts Dict. Chem. VI. 237 Nitrogen, which combines with 3 atoms of hydrogen, is triatomic, triadic, or trivalent.
1894 Times 18 Aug. 10/3 No doubt the passage of..the diatomic form of the substance to the triatomic form..takes place with evolution of heat.
1903 Edinb. Rev. Oct. 393 It [radium] can ozonise oxygen—that is, condense it by rendering its molecules tri-atomic.
This entry has not yet been fully updated (first published 1914; most recently modified version published online June 2018).
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adj.1862