A surname.

plural of Delay

(medicine) Absence of any signs of puberty by a specified age, such as 14 years or 2.5 standard deviations above the mean age at onset of puberty in a population.

The occurrence of a male orgasm very late during sexual intercourse.

A missed abortion.

plural of delayed neutron

(nuclear physics) The point at which the prompt neutrons and delayed neutrons produced by a nuclear fission chain reaction, taken together, are just sufficient to sustain the chain reaction (the state of being delayed critical); in this state, changes in reaction power occur slowly, allowing the reaction to be controlled on human timescales, due to the relatively long time delay associated with the emission of the delayed neutrons necessary to maintain the chain reaction.

(nuclear physics) A neutron produced as a result of nuclear fission which is emitted upon the radioactive decay of a fission product nucleus seconds to minutes later, rather than at the time of the initial fission event. Less than 2% of fission neutrons are delayed neutrons (the exact proportion depends on the nuclide being fissioned).

plural of delayed criticality

(nuclear physics) Of the point at which the prompt neutrons and delayed neutrons produced by a nuclear fission chain reaction, taken together, are just sufficient to sustain the chain reaction, where changes in reaction power occur slowly.