18-letter words containing y, f, r, o, n
- state of emergency — If a government or other authority declares a state of emergency in an area, it introduces special measures such as increased powers for the police or army, usually because of civil disorder or because of a natural disaster such as an earthquake.
- symmetric function — a polynomial in several indeterminates that stays the same under any permutation of the indeterminates.
- treaty of waitangi — a treaty signed in 1840 by Māori chiefs and a representative of the British Government, providing the basis for the British annexation of New Zealand
- ultralow frequency — an electromagnetic wave with a frequency between 300 and 3000 hertz. Abbreviation: ULF, ulf.
- very low frequency — any frequency between 3 and 30 kilohertz. Abbreviation: VLF.
- water of hydration — the portion of a hydrate that is represented as, or can be expelled as, water: now usually regarded as being in true molecular combination with the other atoms of the compound, and not existing in the compound as water.
- with flying colors — with flying colors, with an overwhelming victory, triumph, or success: He passed the test with flying colors.