(slang, derogatory) A person who whinges; a peevish complainer.

The junction site, where a motor neuron releases a neurotransmitter to affect a target, that acts like an effector

(physics) Of or pertaining to sphalerons.

(historical) Initialism of Irish Republican Brotherhood, a secret organisation dedicated to the establishment of an independent democratic republic in Ireland between 1858 and 1924.