ת Tav, the twenty-second letter of the alphabet.—It interchanges with ט, q. v.; dialectically with ש, e.g. שׁוּב, Chald. תּוּב; שָׁבַר, Chald. תְּבַר.—ת a preformative letter for verbal nouns, e.g. תַּבְשִׁיל, fr. בָּשַׁל; תְּרוּמָה, fr. רוּם; an afformative letter, e.g. תַּרְעוֹמֶת, fr. רָעַם. Secondary verbs are formed from such nouns, e.g. תָּרַם, fr. תְּרוּמָה; הִתְחִיל, fr. תְּחִלָּה; or from verbs, e.g. תָּאַב, fr. אָבָה.