| Rank | Word | # Letters |
|
1
|
ethylenediaminetetraacetates
|
28
|
|
2
|
ethylenediaminetetraacetate
|
27
|
|
3
|
electroencephalographically
|
27
|
|
4
|
immunoelectrophoretically
|
25
|
|
5
|
phosphatidylethanolamines
|
25
|
|
6
|
phosphatidylethanolamine
|
24
|
|
7
|
dichlorodifluoromethanes
|
24
|
|
8
|
microelectrophoretically
|
24
|
|
9
|
microspectrophotometries
|
24
|
|
10
|
intercomprehensibilities
|
24
|
|
11
|
electrocardiographically
|
24
|
|
12
|
electroencephalographers
|
24
|
|
13
|
electroencephalographies
|
24
|
|
14
|
overintellectualizations
|
24
|
|
15
|
electroencephalographer
|
23
|
|
16
|
electroencephalographic
|
23
|
|
17
|
overintellectualization
|
23
|
|
18
|
reinstitutionalizations
|
23
|
|
19
|
carboxymethylcelluloses
|
23
|
|
20
|
indistinguishablenesses
|
23
|
|
21
|
intersubstitutabilities
|
23
|
|
22
|
nonrepresentationalisms
|
23
|
|
23
|
hexamethylenetetramines
|
23
|
|
24
|
dichlorodifluoromethane
|
23
|
|
25
|
microspectrophotometers
|
23
|
|
26
|
microspectrophotometric
|
23
|
|
27
|
deinstitutionalizations
|
23
|
|
28
|
deinstitutionalization
|
22
|
|
29
|
otorhinolaryngological
|
22
|
|
30
|
otorhinolaryngologists
|
22
|
|
31
|
encephalomyocarditises
|
22
|
|
32
|
establishmentarianisms
|
22
|
|
33
|
disestablishmentarians
|
22
|
|
34
|
microspectrophotometer
|
22
|
|
35
|
microspectrophotometry
|
22
|
|
36
|
philoprogenitivenesses
|
22
|
|
37
|
phosphoglyceraldehydes
|
22
|
|
38
|
hexamethylenetetramine
|
22
|
|
39
|
constitutionalizations
|
22
|
|
40
|
nonrepresentationalism
|
22
|
|
41
|
incomprehensiblenesses
|
22
|
|
42
|
indistinguishabilities
|
22
|
|
43
|
intercomprehensibility
|
22
|
|
44
|
carboxymethylcellulose
|
22
|
|
45
|
keratoconjunctivitides
|
22
|
|
46
|
keratoconjunctivitises
|
22
|
|
47
|
countercountermeasures
|
22
|
|
48
|
counterinterpretations
|
22
|
|
49
|
counterrevolutionaries
|
22
|
|
50
|
immunohistochemistries
|
22
|
|
51
|
reinstitutionalization
|
22
|
|
52
|
electroencephalographs
|
22
|
|
53
|
electroencephalography
|
22
|
|
54
|
electrophysiologically
|
22
|
|
55
|
overcommercializations
|
22
|
|
56
|
spectrophotometrically
|
22
|
|
57
|
unrepresentativenesses
|
22
|
|
58
|
buckminsterfullerenes
|
21
|
|
59
|
electrocardiographies
|
21
|
|
60
|
electroencephalograms
|
21
|
|
61
|
electroencephalograph
|
21
|
|
62
|
electromyographically
|
21
|
|
63
|
electroretinographies
|
21
|
|
64
|
overcommercialization
|
21
|
|
65
|
overintellectualizing
|
21
|
|
66
|
anthropomorphizations
|
21
|
|
67
|
antiauthoritarianisms
|
21
|
|
68
|
antiferromagnetically
|
21
|
|
69
|
pseudosophistications
|
21
|
|
70
|
psychopharmacological
|
21
|
|
71
|
psychopharmacologists
|
21
|
|
72
|
psychophysiologically
|
21
|
|
73
|
psychotherapeutically
|
21
|
|
74
|
hypercholesterolemias
|
21
|
|
75
|
hypersusceptibilities
|
21
|
|
76
|
immunocytochemistries
|
21
|
|
77
|
immunoelectrophoreses
|
21
|
|
78
|
immunoelectrophoresis
|
21
|
|
79
|
immunoelectrophoretic
|
21
|
|
80
|
acetylcholinesterases
|
21
|
|
81
|
adrenocorticosteroids
|
21
|
|
82
|
adrenocorticotrophins
|
21
|
|
83
|
countercountermeasure
|
21
|
|
84
|
counterdemonstrations
|
21
|
|
85
|
counterinterpretation
|
21
|
|
86
|
neuroendocrinological
|
21
|
|
87
|
neuroendocrinologists
|
21
|
|
88
|
nondenominationalisms
|
21
|
|
89
|
tetrahydrocannabinols
|
21
|
|
90
|
clinicopathologically
|
21
|
|
91
|
incomprehensibilities
|
21
|
|
92
|
indistinguishableness
|
21
|
|
93
|
institutionalizations
|
21
|
|
94
|
interchangeablenesses
|
21
|
|
95
|
interconvertibilities
|
21
|
|
96
|
internationalizations
|
21
|
|
97
|
intersubstitutability
|
21
|
|
98
|
compartmentalizations
|
21
|
|
99
|
constitutionalization
|
21
|
|
100
|
contemporaneousnesses
|
21
|