FROM STRONG’S HEBREW DICTIONARY (1890)

Strong’s Hebrew Dictionary (1890) — public domain, printed whole.

tesha` tay'-shah — or (masculine) tishtah {tish-aw'}; perhaps from 8159 through the idea of a turn to the next or full number ten; nine or (ord.) ninth:--nine (+ -teen, + -teenth, -th).

see HEBREW for 08159