Word: 
Words and phrases whose definition contains decay:  (78 results)
2 letters:
at
3 letters:
rot
5 letters:
sound
6 letters:
caries, cavity, effete, miasma, morbid, rotted, rotten
7 letters:
carious, corrupt, crumble, decayed, keep up, putrefy, tainted
8 letters:
astatine, beta ray, conserve, decadent, ghoulish, in truth, laterite, maintain, preserve, root rot, soft rot
9 letters:
alpha ray, black rot, brown rot, decayable, gamma ray, radiation, shielding, soundness, spoilable
10 letters:
beta decay, corruption, delapidate, deliquesce, dilapidate, perishable, spoilables, weak force
11 letters:
alpha decay, cleistocarp, perishables, putrefiable, putrescible, tooth decay, unsoundness
12 letters:
black locust, fluoridation, preservation, preservative, putrefaction
13 letters:
beta particle, dental caries, imputrescible, plectomycetes, radioactivity, transmutation
14 letters:
beta radiation, cleistothecium, fluoridization, genus bacillus, nitrogen cycle
15 letters:
alpha radiation, gamma radiation, imperishability, imperishingness, sodium fluoride
16 letters:
atomic number 85, weak interaction
18 letters:
electron radiation
19 letters:
class plectomycetes
22 letters:
potassium-argon dating
Commonly used words are shown in bold. Rare words are dimmed.
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