PS

*tišˁ- - nine (Kogan 2009: 73)

Akkadian
tiše - nine (CAD T 432, AHw. 1362)
m.rect. tišûm; f.abs. ti/ešīt; f.rect. ti/ešītum
Ugaritic
tšˁ - nine (DUL³ 868)
Phoenician
tšˁ - nine (DNWSI 1235)
Hebrew
tešaˁ - nine (HALOT 1802)
Syriac
tšaˁ - nine (LSyr. 838, SL 1674)
Arabic
tisˁ- - nine (Lane 306)
Geez
tesˁ- - nine (CDG 580)
Tigre
səˁ - nine (WTS 311)
Tigrinya
təšəˁattä, täsˁattä - nine (TED 1254)
Amharic
täsiyat, täsəyat - noon, midday (AED 974)
Also Old Amharic täsat ‘die neunte Stunde’ (Littmann 1943:489)
Mehri
sɛ̄ - nine (ML 338)

Throughout MSA, *t- in the reflexes of PS *tišˁ- ‘nine’ is lost, whereas *š is reflected as *s (see Testen 1998a and SED I p. xci. for the affricate theory of PS consonantism).

Jibbali
sɔˁ - nine (JL 220)

Throughout MSA, *t- in the reflexes of PS *tišˁ- ‘nine’ is lost, whereas *š is reflected as *s (see Testen 1998a and SED I p. xci. for the affricate theory of PS consonantism). Admittedly, forms with t- (and ‑s‑) can be found in the Vienna corpus (Bittner 1916:50).