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on tiptoe standing or walking on the toes, especially to proceed quietly or cautiously. [2 definitions]
onto to a position on or on top of. [2 definitions]
on top of in total control of. [3 definitions]
onward toward a point or position ahead in space or time. [2 definitions]
ooze1 to leak out slowly. Liquids, gases, and sounds may ooze.
opal a mineral that is white, black, blue, or yellow. Opals are used as gems.
opaque not letting light pass through. [2 definitions]
OPEC an association made up of several Arab nations that sell the oil they produce to other countries. OPEC is an abbreviation for Organization of Petroleum Exporting Countries.
open allowing something or someone to pass through or to get to the inside; not shut or closed. [16 definitions]
opener someone or something that opens. [3 definitions]
opening the act, process, or result of making open or causing to become open. [5 definitions]
openly in a way that involves no hiding or lying.
open-minded not having made opinions or decisions ahead of time; willing to consider new ideas.
opera1 a play in which all or most of the words are sung and the music is played by an orchestra.
operate to work or run. [3 definitions]
operation the act or process of working or running. [4 definitions]
operator someone who controls the working of a machine or the activities of a business. [2 definitions]
operetta a short, funny opera, with words that are spoken as well as sung.
ophthalmologist a doctor who works in the branch of medicine that studies and treats diseases of the eye.
ophthalmology the branch of medicine that studies and treats diseases of the eye.
opinion what one thinks about something or somebody; viewpoint. An opinion is not necessarily based on facts. Feelings and experiences usually help a person form an opinion. [3 definitions]