Scarce but reliable attestation: only Akk. and Arb.
Variants: libbuḫu, ilibbuḫu, ellambuḫu, ilbuḫu, illabuḫu, ellabuḫu. Von Soden suggests that this is a Sum. loanword (see a detailed discussions in [Lieberman 222]). Part of the forms with prefixed ˀi- (< *ˀa- influenced by -i- of the second syllable implying *ˀa-libbuḫ- ?).
Note the translation ‘vésicule de musc’ (”musk vesicle”) in [Belot Arb.-Fr. 718] as well as labīḫ- ‘bladder, container for musk’ in [WKAS II 108].