8-letter words starting with o
- operated — to work, perform, or function, as a machine does: This engine does not operate properly.
- operates — Third-person singular simple present indicative form of operate.
- operatic — of or relating to opera: operatic music.
- operator — a person who operates a machine, apparatus, or the like: a telegraph operator.
- opercula — Botany, Zoology. a part or organ serving as a lid or cover, as a covering flap on a seed vessel.
- operetta — a short opera, usually of a light and amusing character.
- opheltes — the son of King Lycurgus of Nemea who was killed in infancy by a serpent and in whose memory the Nemean games were held.
- ophidian — belonging or pertaining to the suborder Ophidia (Serpentes), comprising the snakes.
- ophidiid — any fish of the family Ophidiidae, comprising the cusk-eels.
- ophidism — Poisoning by snake venom.
- opificer — someone who makes something; a craftsman
- opinable — thinkable or able to be an opinion
- opinicus — a heraldic monster having the head, neck, and wings of an eagle, the body of a lion, and the tail of a bear.
- opinions — Plural form of opinion.
- opiumism — the addictive use of opium as a stimulant or intoxicant.
- opopanax — (obsolete) A gum resin obtained from the root of Opopanax chironium, formerly used in medicine.
- opossums — Plural form of opossum.
- oppidans — Plural form of oppidan.
- oppilant — blocking, hindering, or obstructing
- oppilate — to stop up; fill with obstructing matter; obstruct.
- opponent — a person who is on an opposing side in a game, contest, controversy, or the like; adversary.
- opposers — to act against or provide resistance to; combat.
- opposing — to act against or provide resistance to; combat.
- opposite — situated, placed, or lying face to face with something else or each other, or in corresponding positions with relation to an intervening line, space, or thing: opposite ends of a room.
- oppugned — Simple past tense and past participle of oppugn.
- oppugner — Someone who oppugns; an opponent.
- opsimath — (rare) A person who learns late in life.Oxford English Dictionary, 3rd ed., 2004.
- opsonify — to facilitate phagocytosis of (a microorganism, as a bacterium) by treatment with opsonin.
- opsonins — Plural form of opsonin.
- opsonium — any food used as a relish, such as chutney
- opsonize — to increase the susceptibility of (bacteria) to ingestion by phagocytes.
- optation — (obsolete) The act of optating; a wish.
- optative — designating or pertaining to a verb mood, as in Greek, that has among its functions the expression of a wish, as Greek íoimen “may we go, we wish we might go.”.
- opticals — (India) spectacles.
- optician — a person who makes or sells eyeglasses and, usually, contact lenses, for remedying defects of vision in accordance with the prescriptions of ophthalmologists and optometrists.
- opticist — a person engaged in the fields of theoretical or applied optics.
- optimacy — Government by the nobility.
- optimate — a Roman aristocrat
- optimise — to make as effective, perfect, or useful as possible.
- optimism — a disposition or tendency to look on the more favorable side of events or conditions and to expect the most favorable outcome.
- optimist — an optimistic person.
- optimize — to make as effective, perfect, or useful as possible.
- optional — left to one's choice; not required or mandatory: Formal dress is optional.
- optioned — the power or right of choosing.
- optionee — a person who acquires or holds a legal option.
- optogram — (physiology) An image of external objects fixed on the retina by the photochemical action of light on the visual purple.
- optology — the science of testing eyes for lenses
- optotype — type used on an eye chart.
- opulence — wealth, riches, or affluence.
- opuntias — Plural form of opuntia.