18-letter words containing o, f, c, u, t, s
- sub-classification — to arrange in subclasses.
- surface-to-surface — (of a missile, message, etc.) capable of traveling from a base on the surface of the earth to a target also on the surface.
- symmetric function — a polynomial in several indeterminates that stays the same under any permutation of the indeterminates.
- ur of the chaldees — the city where Abraham was born, sometimes identified with the Sumerian city of Ur. Gen. 11:28, 31; 15:7; Neh. 9:7.