18-letter words containing r, h, p, o, s, i
- triphosphoric acid — the hypothetical acid H 5 P 3 O 10 , known chiefly by its salts.
- warehouse capacity — the amount of storage space in a warehouse
- white iron pyrites — marcasite
- wilson's phalarope — a phalarope, Phalaropus tricolor, that breeds in the prairie regions of North America and winters in Argentina and Chile.
- wireless telephone — Now Rare. radiotelephony.
- wireless telephony — Now Rare. radiotelephony.
- withdrawal symptom — effects of stopping a drug
- working hypothesis — See under hypothesis (def 1).
- world championship — an international competition in a particular sport or activity for people all around the world