What's the difference between philter and philtre?
Philter
Definition:
(n.) A potion or charm intended to excite the passion of love.
(v. t.) To impregnate or mix with a love potion; as, to philter a draught.
(v. t.) To charm to love; to excite to love or sexual desire by a potion.
Example Sentences:
(1) The authors discuss of the relation between mother-phoetus from an immunological point of view and the real protection at birth because of the passing through the placental philter of maternal immunoglobulins.