-ist

(Greek > Latin: a suffix; one who believes in; one who is engaged in; someone who does something)

oneiroscopist
A specialist in the analysis of dreeams.
onomantist, onomomantist
Someone who divines or foretells the future with names.
onomatologist
Someone who is versed or is a specialist in the history of names.
onychomantist
Someone who predicts a person’s future by the appearance of the fingernails themselves.
onychophagist (s), onychophagists (pl) (noun forms)
Those who chew on their fingernails: "Some onychophagists try to avoid letting others see their nail biting habits, but quite often they are so upset that they can't help themselves."
oologist
ophiologist
1. A specialist in the study of snakes.
2. Someone who is versed in the natural history of serpents.
ophiomantist
Someone who tells the future, or past, by observing snakes.
ophiophilist
Someone who has a special fondness for snakes and other reptiles.
A man is an ophiophilist who loves his serpent pets.
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ophisophilist
A collector of snake skins.
ophthalmologist (s) (noun), ophthalmologists (pl)
1. A physician who specializes in the care and treatment of the eyes: Marie was having trouble seeing things clearly from long distances so she made an appointment with an ophthalmologist to get the kind of eyeglasses that would help her have better vision.
2. Etymology: from Greek opthalmos, “eye" + -logia, "the study of".
A trained person who is a specialist in the treatment of eye defects.
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opportunist (s) (noun), opportunists (pl)
A person who takes advantage of situations or events, having no thought or consideration for the effects that might take place: Maxine is an opportunist who is always trying to sit in the front row whenever the governor is speaking.
opticophilist
A collector of eye glasses.
optimist (s) (noun), optimists (pl)
1. Someone who believes that the best can and will take place.
2. A person who tends to expect that good things will happen.
3. Somebody who tends to feel hopeful and positive about future outcomes.
4. Anyone who looks on the bright side of things, or takes hopeful views; as opposed to a pessimist.
optometrist
A health care professional who is licensed to provide primary eye care services:
  1. To examine and diagnose eye diseases such as glaucoma, cataracts, and retinal diseases and, in certain states in the U.S., to treat them.
  2. To diagnose related systemic (bodywide) conditions such as hypertension and diabetes that may affect the eyes.
  3. To examine, to diagnose, and to treat visual conditions; such as, nearsightedness, farsightedness, astigmatism, and presbyopia.
  4. To prescribe glasses, contact lenses, low vision rehabilitation, and medications; as well as, to perform minor surgical procedures; such as, the removal of foreign bodies.