1. a potion, charm, or drug supposed to cause the person taking it to fall in love, usually with some specific person; a drink supposed to excite sexual love in the drinker.
2. a magic potion for any purpose.
3. to enchant or bewitch with a philter.
Etymology: from Latin philtrum, from Greek philtron (love potion), from philos (loving).
[John William Waterhouse - Tristan & Isolde]