يهُام
ʸhom or šɔm (du. šámi or ʸhámi)
basic morphological information

n. (f.)

1. sun; 2. day
солнце; день
شمس، يوم
CSOL I 660; CSOL I 694; CSOL II 627; LS 210, 418; Naumkin et al. 2015a:92
text examples

1. šɔm tešráḳaḥ men šarḳ men díˀseʰ ḥaḷf ‘The sun rises from the east, from its place!’ (CSOL II 4:45)
2.

a. ṭey šɔm ˁeẓ̂ díˀʸheʰ eˀḷhíten múgšem ker ḥíšeʰ ‘One day the boy was driving his cows across a narrow pass between two precipices’ (CSOL II 1:30)

b. ṭey ʸhom gédaḥ ˁag ḥádrehi ken iľ-ḥáder ‘One day a man from the tribe di-Hader came’ (CSOL II 7:25)

morphological notes

The word is not used in the plural, the suppletive plural with the meaning ‘days’ is énhor.

root
ʸh/šom
derivates
etymology

As argued in Kogan 2015:579–580, the Soqotri word is to be derived from PS *yawm- ‘day’. The traditional equation with PS *šamŝ- (LS 418), very persistent in Semitological literature, is to be abandoned as due to superficial similarity only. 

continental MSA
By regular expression