18-letter words containing f, i, r, e, n, y
- symmetric function — a polynomial in several indeterminates that stays the same under any permutation of the indeterminates.
- thermal efficiency — the ratio of the work output of a heat engine to the heat input expressed in the same units of energy.
- 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
- university faculty — a division within a university comprising one subject area, or a number of related subject areas
- 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.
- wildlife sanctuary — an area where wild animals and plants are protected