ambi- Look up ambi- at
word-forming element meaning "both, on both sides," from Latin ambi- "around, round about" (before vowels amb-, also sometimes reduced to am-, an-), from PIE *ambhi "around" (source also of Greek amphi "round about;" Sanskrit abhitah "on both sides," abhi "toward, to;" Avestan aibi; Old English ymbe, German um; Gaulish ambi-, Old Irish imb- "round about, about;" Old Church Slavonic oba; Lithuanian abu "both"). The PIE root probably is an ablative plural of *ant-bhi "from both sides," from *ant- "front, forehead" (see ante-).