Tailed Sonnet, a sonnet with a tail (coda), or addition. About the only one in English is Milton's On the New Forcers of Conscience: the rimes are abba abba cde dec5 c3ff5f3gg5.
Tercet, a group of three lines, especially in the sestet of the Italian sonnet, [102], [120].
Terza Rima, an Italian rime scheme aba bcb cdc ... yzy zz; rarely used in English, but triumphantly (in stanzas) in Shelley's Ode to the West Wind, [164].
Tetrameter, a classical term (four 'measures' or eight feet) incorrectly used for the English 4-stress line, [52].
Thesis, see Arsis.
Time, an inevitable element in English verse (as well as prose), but not the sole basis, [56] ff.
Tone-color, Tone Quality, 'timbre,' the characteristic of a sound determined by the number of partial tones (overtones), as richness, sweetness, thinness, stridency; hence sometimes applied to the musical quality of a verse or phrase, [6] and note, [177].
Tribrach, a classical foot, ◡ ◡ ◡, [51].
Trimeter, a classical term (three 'measures' or six feet) incorrectly used for the English 3-stress line, [52].
Triolet, a French metrical form, mainly for light themes, riming ABaAabAB(the capitals indicating repeated lines) and usually with short lines, [163].