The Proto-Indo-European word *h₃em-
Word *h₃em-
Meaning bitter
Synonyms *h₂em-, *h₂emros

Comments
Gk. ōmos, Lat. amārus, Arm. hum, Skr. amla, Eng. ampre/, ON apr, Ltv. amols, Alb. ëmblë, XMK abro-

Other words that might be of interest
*kwat- ‘sour’, *sweh₂d-u- ‘sweet’, *(s)terh₁- ‘stiff’, *suhₓros ‘sour, acid’, *st(h₂)eug- ‘stiff’