Menu Toggle
Merriam-Webster Logo
Chatbot
Chatbot
Games
Word of the Day
Grammar
Word Finder
Slang
New
Newsletters
Wordplay
Rhymes
Thesaurus
Join MWU
More
Games
Word of the Day
Grammar
Wordplay
Slang
Rhymes
Word Finder
Newsletters
New
Thesaurus
Join MWU
Shop
Books
Merch
Log In
Username
My Words
Recents
Account
Log Out
Est. 1828
Words That Start With O
Browse the Dictionary
a
b
c
d
e
f
g
h
i
j
k
l
m
n
o
p
q
r
s
t
u
v
w
x
y
z
0-9
bio
geo
« Previous
Next »
-o
...
oblanceolate
oblast
...
obtenebrate
obtention
...
octadecyl
octadrachm
...
odontophorine
odontophorous
...
official stamp
official time at bat
...
oilbird
oil-break switch
...
old-man fern
old man saltbush
...
ololiuqui
olona
...
on brand
on-brand
...
onfall
on file
...
on the diagonal
on the docket
...
oophore
oophorectomies
...
open-to-buy
open to debate
...
opisthogoneate
opisthograph
...
ora
orabassu
...
order-in-council
ordering
...
Orientalize
orientalized
...
orps
orra
...
osculating
osculating circle
...
ostracoderm
Ostracodermi
...
outbalancing
outbargain
...
outhalf
outhaul
...
outpolls
outpopulate
...
outsweepings
outsweeten
...
overberg
overbias
...
overdramatizations
overdramatize
...
overhearing
overheat
...
overplayed
overplaying
...
overstaffed
overstaffing
...
ovine malaria
ovipara
...
oxycellulose
oxychloride cement
...
ozotype
« Previous
Next »
Word of the Day
vamoose
See Definitions and Examples
»
Get Word of the Day daily email!