PS

*ḥil(Vl)- - canal (anat.), urethra (?) (SED I No. 115)

A difficult case with scarce attestation.

Syriac
ḥeltā - vagina (Brock. 232)
Syr. ḥeltā ‘vagina’ and Tgr. ḥəlelät ‘penis’ (hardly an Arabism in view of difference in meaning and pattern; pace [Leslau Loanwords 166]) can be as well compared to each other and to Arb. ‘canal of the penis’ still making a Sem. anatomic term with a possible meaning ‘canal of the genital organ’.
Arabic
ˀiḥlīl- - udder or penis canal (BK 1 474)
A very specified anatomic meaning is similar in Arb. and Tgr. ḥəlil. It may be alternatively explained by an Arabism in Tgr., in which case the Arb. term, possibly with an original meaning ‘opening’ or ‘canaľ without any anatomic connotations, should be compared to Akk. ḫālilu (ḫalīlu) ‘a kind of canal or ditch’ SB [CAD ḫ 42] and Syr. ḥəlīlā ‘rima; caverna; tubus’ [Brock. 232]. But in view of difference in meaning and pattern, pace Syr. ḥeltā ‘vagina’ and Tgr. ḥəletät ‘penis’ are hardly Arabisms ([Leslau Loanwords 166]). They can be as well compared to each other and to Arb. ‘canal of the penis’ still making a Sem. anatomic term with a possible meaning ‘canal of the genital organ’.
Tigre
ḥəlil- - orifice of the teat; the urethra (WTS 53)

Probably an Arabism that explains a very specified anatomic meaning similarity with Arb. But on the hand, it’s hardly an Arabism in view of difference in meaning and pattern; pace [Leslau Loanwords 166].