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ter-diurnal
ter-diurnal adj.
Brit. 
/ˌtəːdʌɪˈəːnl/
, /ˌtəːdʌɪˈəːnl/U.S. /ˌtərdaɪˈərn(ə)l/
occurring or done thrice a day./ˌtərdaɪˈərn(ə)l/ΘΚΠ
the world > time > period > a day or twenty-four hours > [adjective] > occurring specific number of times a day
bimeridian1869
semi-daily1869
tridiurnal1884
ter-diurnal1892
di-diurnal-
1892 Ld. Kelvin Presid. Addr. Royal Soc. 30 Nov. The largeness of the solar semi-diurnal, ter-diurnal, and quarter-diurnal constituents found by the harmonic analysis.
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