The American Heritage® Dictionary of the English Language: Fourth Edition. 2000.
Appendix I
Indo-European Roots
ENTRY:
angh-
DEFINITION:
Tight, painfully constricted, painful. Oldest form *anh-, becoming *angh- in centum languages. Derivatives include anger, hangnail, and quinsy. 1.agnail, hangnail, from Old English ang-nægl, painful spike (in the flesh), corn, excrescence (nægl, spike; see nogh-), from Germanic *ang-, compressed, hard, painful. 2. Suffixed form *angh-os-.anger, from Old Norse angr, sorrow, grief, from Germanic *angaz.3. Suffixed form *angh-os-ti-.angst1, from Old High German angust, anxiety, from Germanic *angusti-.4.anxious, from Latin angere, to strangle, torment. 5. Suffixed form *angh-os-to-.anguish, from Latin angustus, narrow. 6.quinsy, from Greek ankhein, to squeeze, embrace. 7.angina, from Greek ankhon, a strangling. (Pokorny anh- 42.)