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oboe
A woodwind musical instrument.
obscene
Offensive or disgusting by accepted standards.
obscenity
An offensive or indecent act or word.
obscure
Not well-known or hard to understand.
obscurity
The state of being unknown or hidden.
obscurum per obscurius
Explaining something unclear with even more unclear terms.
observable
Able to be seen or noticed.
observance
The act of following or respecting rules.
observant
Noticing details quickly and accurately.
observation
The act of watching something carefully.
observational
Based on carefully watching people or things.
observatory
A building for looking at stars and planets.
observe
to comply with or follow a rule or law
observer
a device that monitors or records
obsess
To think about something constantly.
obsession
An uncontrollable preoccupation with something.
obsessive
Having an excessive preoccupation with something.
obsessively
In a way that shows excessive focus or concern.
obsidian
A black volcanic glass used for tools and decoration.
obsolescence
The state of being outdated or no longer useful.
obsolete
No longer used or out of date.
obstacle
Something that blocks or hinders progress.
obstetric
Related to childbirth and pregnancy care.
obstetrician
A doctor specializing in pregnancy and childbirth.