The acute onset of paranoia in otherwise normal and balanced people triggered by the mention of a specific topic.

A fundraising event where rubber ducks are placed in a stream or river so as to be carried by the current, the winner being the first duck to reach a designated end point.

(linguistics) The derivation of a word from another word (of a differing part of speech) without modification; anthimeria.

plural of derogatory clause

plural of dermal bone

plural of derivative instrument

(algebra) With respect to a Boolean variable x_i: The XOR-sum of the positive and negative Shannon cofactors of the given derived function with respect to x_i. In symbols: ∂f/∂x_i(⃑x)=f_x_i(⃑x)⊕f_̄x_i(⃑x).

Shortening of Derby Kelly.

(Cockney rhyming slang) belly

(calculus, mathematical analysis) Given a real or complex function f, the ratio of the value of the derivative to the value of the function, (f')/f, regarded as a function.