(calculus) A formula for computing the derivative of the functional composition of two or more functions.

A boat fitted up for recovering lost cables, anchors, etc.

(nautical) An opening in the deck, lined with iron, through which the cable is passed into the lockers or tiers.

laburnum / Used other than figuratively or idiomatically: see golden, chain.

A surname.

A Cunningham chain of the first kind of length n is a sequence of prime numbers (p₁, ..., pₙ) such that for all 1 ≤ i < n, pᵢ₊₁ = 2pᵢ + 1.

(informal, Hiberno-English) Very ignorant or foolish, sullen or in a bad temper.

plural of chalk bag

Euphemistic form of snowball's chance in hell.

Dated form of armchair.