-or; -our (primarily British)

(Latin: a suffix; state of, result of; he who, that which)

A suffix that forms nouns. British spelling is usually -our.
annihilator (s) (noun), annihilators (pl)
archtraitor (s) (noun), archtraitors (pl)
A primary traitor, specifically Satan and Judas Iscariot: In some religious faiths, Satan and Judas Iscariot are considered archtraitors based on the stories of their betrayals of others.
aspirator (s) (noun), aspirators (pl)
assenter, assentor (s) (noun); assenters; assentors (pl)
Those who agree, cooperate with, or approve of an action or a plan: Most of the parents were assenters to the decision of the school to delay the beginning of classes by one hour each day on a regular schedule.

All of the students were assentors to the plans for the dance on Saturday.

Someone; usually a man, who navigates in outer space either in interplanetary travel or in interstellar travel.
attestor (s) (noun), attestors (pl)
Anyone who vouches to the genuineness of a document or another person's signature by adding his or her own name.
auditor, auditress (s) (noun); auditors; auditresses (pl)
1. A qualified accountant: Susan is an authorised auditress who inspects the bookkeeping records and practices of a business or other organization.
2. A university, or college, student registered for a course without getting credit and with no obligation to do any of the work assigned to the class: Although Jeff was enrolled at the university and had a major in biology, he still wanted to attend classes in German, as an auditor, because he wanted to go there after receiving his diploma.
3. Someone who listens attentively: Even at the age of 65, Mr. Hathaway loved to sit quietly in a lecture hall as an auditor and listen to presentations on some topics that interested him.
auscultator (s) (noun), auscultators (pl)
1. A person who uses a diagnostic procedure to listen to sounds within a person's body; An auscultator is an individual who uses a procedure for detecting certain defects or conditions by listening for normal and abnormal heart, breath, bowel, fetal, and other sounds in the body.
2. An instrument used to listen to sounds within the body; a stethoscope: Dr. Green asked the nurse to give him an auscultator so that he could detect any irregular and strange noises within Janet's body.
auspicator (s) (noun), auspicators (pl)
Someone or something that predicts that an event will take place: "The dark clouds and thunder were the auspicators that indicated a rainstorm was coming."
bioreactor (s) (noun), bioreactors (pl)
A large tank for growing microorganisms used in industrial production: A bioreactor is a fermentation chamber or vat that is used for growing biochemically active matter or microorganisms which are then used for making drugs or for recycling waste.

A microorganism created in a bioreactor and, through its biochemical reactions, can produce medically or commercially useful materials, e.g., beer from fermentation of yeast or insulin from genetically altered bacteria.

A living cell culture genetically engineered in a bioreactor can be used to produce materials useful for research in biology, medicine, and industrial processes.

biosensor (s) (noun), biosensors (pl)
1. A device that feels and analyzes biological information: A biosensor is a device such as a thermometer which is used to assess or analyze the temperature of blood pressure, heart rate, or a more sophisticated determination of chemicals and enzymes in body fluids.

The biosensor can also be used in the laboratory or placed within the body.

2. A device to monitor and to transmit information about biological processes. such as the effect of motion on an animal in space: After many trials, the scientists developed a biosensor that worked in the weightlessness of the space capsule.
candor (s) (noun), candors (pl)
The state of being sincere and honest in speech or expressing oneself: Alice admired Jim's candor when he was talking about what went wrong with his first marriage.
A frank or harsh comment.
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An obvious response.
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canor (s) (noun), canors (pl)
Melody or sweet singing.
captor (s) (noun), captors (pl)