18-letter words containing y, i, e, l, d, p
- sodium polysulfide — a yellow-brown, water-soluble, granular powder, Na 2 S n , used chiefly in the manufacture of sulfur dyes, insecticides, and synthetic rubber.
- solitary sandpiper — a North American sandpiper, Tringa solitaria, of inland wetlands, having a brownish-gray, white-spotted back and whitish underparts.
- superciliary ridge — browridge.
- the encyclopedists — the writers of the French Encyclopedia (1751-72) edited by Diderot and d'Alembert, which contained the advanced ideas of the period
- unit-linked policy — a life-assurance policy, the investment benefits of which are directly in proportion to the number of units in a unit trust purchased on the policyholder's behalf
- white-spotted hyla — a type of tree frog (H. leucophyllata) of tropical America