Dictionary![]() ![]() Th—Symbol, Chem. thorium. Th 227—Symbol, Chem. radioactinium. Also,Th-227 -tha suffix forming nouns of action (birth) or abstract nouns denoting quality or condition (depth; length; warmth). -tha suffix used in the formation of ordinal numbers (fourth, tenth), in some cases, added to altered stems of the cardinal (fifth; twelfth). -thvar. of -eth 1 : doth. Th.Thursday. T.H.Territory of Hawaii. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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