nuclearadjective1 of or relating to the nucleus of an atom.• denoting, relating to, or powered by the energy released in nuclear fission or fusion• denoting, possessing, or involving weapons using this energy2 Biology of or relating to the nucleus of a cellORIGIN mid 19th cent.: from nucleus + -ar 1 .nucleusnounthe central and most important part of an object, movement, or group, forming the basis for its activity and growth• Physics the positively charged central core of an atom, containing most of its mass.• Biology a dense organelle present in most eukaryotic cells, typically a single rounded structure bounded by a double membrane, containing the genetic material.• Astronomy the solid part of the head of a comet.• Anatomy a discrete mass of gray matter in the central nervous system.ORIGIN early 18th cent.: from Latin, literally 'kernel, inner part,' diminutive of nux, nuc- 'nut.'
kernelnouna softer, usually edible part of a nut, seed, or fruit stone contained within its hard shell.• the seed and hard husk of a cereal, esp. wheat.• the central or most important part of something.• the most basic level or core of an operating system of a computer, responsible for resource allocation, file management, and security.• Linguistics denoting a basic unmarked linguistic string.ORIGIN Old English cyrnel, diminutive of corn 1 .corenoun1 the tough central part of various fruits, containing the seeds.2 the central or most important part of something, in particulargermnoun1 a microorganism, esp. one that causes disease.2 a portion of an organism capable of developing into a new one or part of one. Compare with germ cell .• the embryo in a cereal grain or other plant seed. Compare with wheat germ .• an initial stage from which something may develop.ORIGIN late Middle English (sense 2) : via Old French from Latin germen 'seed, sprout.' Sense 1 dates from the late 19th cent.essencenounthe intrinsic nature or indispensable quality of something, esp. something abstract, that determines its character.• Philosophy a property or group of properties of something without which it would not exist or be what it is.• something that exists; in particular, a spiritual entity.• an extract or concentrate obtained from a particular plant or other matter and used for flavoring or scent.ORIGIN late Middle English : via Old French from Latin essentia, from esse 'be.'
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