Here is the word for this week:

philter \FIL-ter\, noun:

1. A magic potion for any purpose.

2. A potion, charm, or drug supposed to cause the person taking it to fall in love, usually with some specific person.

Tell me now, fairy as you are - can't you give me a charm, or a philter, or something of that sort, to make me a handsome man ? "

-- Charlotte Brontë, Jane Eyre

Mariamne had told him it was a love philter and promised a large reward if he would get me to drink it without my knowledge.

-- Michel Tournier, Ralph Manheim, The Four Wise Men

Philter originates from the Greek philtron, "love potion," which itself derives from the Greek philos "love of."

The British usually spell it "philtre," which looks more exotic.