A reference book containing practical information prepared by, or intended for, people doing fieldwork.

plural of Celtic field

A small field showing evidence of prehistoric agriculture, found in northwest Europe.

plural of perfect field

(algebra, field theory) A field K such that every irreducible polynomial over K has distinct roots.

plural of splitting field

(algebra, Galois theory) (of a polynomial) Given a polynomial p over a field K, the smallest extension field L of K such that p, as a polynomial over L, decomposes into linear factors (polynomials of degree 1); (of a set of polynomials) given a set P of polynomials over K, the smallest extension field of K over which every polynomial in P decomposes into linear factors.

ice formed in the polar seas in large surfaces, distinguished from icebergs

plural of gas field

An area of land or seabed where natural gas can be extracted in commercially viable quantities.