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fission    音标拼音: [f'ɪʃən]
n. 裂开,分裂,裂变

裂开,分裂,裂变

fission
n 1: reproduction of some unicellular organisms by division of
the cell into two more or less equal parts
2: a nuclear reaction in which a massive nucleus splits into
smaller nuclei with the simultaneous release of energy [synonym:
{fission}, {nuclear fission}]

Fission \Fis"sion\, n. [L. fissio. See {Fissure}.]
1. A cleaving, splitting, or breaking up into parts.
[1913 Webster]

2. (Biol.) A method of asexual reproduction among the lowest
(unicellular) organisms by means of a process of
self-division, consisting of gradual division or cleavage
of the into two parts, each of which then becomes a
separate and independent organisms; as when a cell in an
animal or plant, or its germ, undergoes a spontaneous
division, and the parts again subdivide. See
{Segmentation}, and {Cell division}, under {Division}.
[1913 Webster]

3. (Zool.) A process by which certain coral polyps,
echinoderms, annelids, etc., spontaneously subdivide, each
individual thus forming two or more new ones. See
{Strobilation}.
[1913 Webster]

4. (Physics) The act or process of disintegration of an
atomic nucleus into two or more smaller pieces; called
also nuclear fission. The process may be spontaneous or
induced by capture of neutrons or other smaller nuclei,
and usually proceeds with evolution of energy.
[PJC]

124 Moby Thesaurus words for "fission":
ablate, abscission, accelerate, activate, alpha decay, amputation,
atom-chipping, atom-smashing, atomic disintegration,
atomic reaction, atomization, atomize, beta decay, bifurcate,
bisect, bombard, bombardment, branch, break into pieces,
break to pieces, break up, breeding, bullet, butchering, by two,
catalysis, catalyst, chain reaction, chopping, cleavage, cleave,
come apart, consume, corrode, crack up, crash, cross-bombard,
crumble, crumble into dust, crunch, crush, cut in two,
cut to pieces, cutting, decay, decompose, demolish, dialysis,
dichotomize, dichotomy, diffuse, dimidiate, disintegrate,
disintegration series, disjoin, disorganize, disperse, disrupt,
dissociation, dissolve, divide, enucleation, erode,
exchange reaction, excision, fall to pieces, fission reaction,
fork, fragment, gamma decay, grind, halve, hydrolysis, hydrolyst,
in half, ionization, laceration, make mincemeat of, mince, molder,
mutilation, neutron reaction, nonreversible reaction,
nuclear fission, nucleization, nucleize, photodisintegration,
photolysis, proton gun, proton reaction, pulverize, ramify,
rending, resection, reversible reaction, ripping, scatter,
scission, section, severance, shatter, shiver, slashing, slicing,
smash, smash the atom, smash up, splinter, split, split in two,
splitting, splitting the atom, squash, squish, stimulation,
subdivide, surgery, target, tearing, thermolysis,
thermonuclear reaction, transect, waste away, wear away

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