18-letter words containing p, a, l, m, t, i
- the family compact — the ruling oligarchy in Upper Canada in the early 19th century
- the middle passage — the journey across the Atlantic Ocean from the W coast of Africa to the Caribbean: the longest part of the journey of the slave ships sailing to the Caribbean or the Americas
- unit magnetic pole — the unit of magnetic pole strength equal to the strength of a magnetic pole that repels a similar pole with a force of one dyne, the two poles being placed in a vacuum and separated by a distance of one centimeter.
- withdrawal symptom — effects of stopping a drug