| opticopupillary | Relating to the optic nerve and the pupil. (05 Mar 2000) |
|---|---|
| optics | That branch of physical science which treats of the nature and properties of light, the laws of its modification by opaque and transparent bodies, and the phenomena of vision. Origin: Cf. F. Optique, L. Optice, Gr. (sc). See Optic. Source: Websters Dictionary (01 Mar 1998) |
| optigraph | A telescope with a diagonal eyepiece, suspended vertically in gimbals by the object end beneath a fixed diagonal plane mirror. It is used for delineating landscapes, by means of a pencil at the eye end which leaves the delineation on paper. Origin: Optic + -graph: cf. F. Opticographe. See Optic. Source: Websters Dictionary (01 Mar 1998) |
| optimal | The best, the most favourable. (18 Nov 1997) |
| optimism | 1. <psychology> The opinion or doctrine that everything in nature, being the work of God, is ordered for the best, or that the ordering of things in the universe is such as to produce the highest good. 2. A disposition to take the most hopeful view; opposed to pessimism. Origin: L. Optimus the best; akin to optio choice: cf. F. Optimisme. See Option. Source: Websters Dictionary (01 Mar 1998) |
| optimist | 1. <psychology> One who holds the opinion that all events are ordered for the best. 2. One who looks on the bright side of things, or takes hopeful views; opposed to pessimist. Origin: Cf. F. Optimiste. Source: Websters Dictionary (01 Mar 1998) |
| optimistic | 1. <psychology> Of or pertaining to optimism; tending, or conforming, to the opinion that all events are ordered for the best. 2. Hopeful; sanguine; as, an optimistic view. Source: Websters Dictionary (01 Mar 1998) |
| optimum | The best or most suitable; e.g., denoting the dose of a remedy likely to give most benefit with fewest side effects, the temperature or pH at which an enzyme has maximal activity. Origin: L. Ntr. Sing. Of optimus, best (05 Mar 2000) |
| optimum dose | The dose of a drug or radiation that will produce the desired effect with minimum likelihood of undesirable symptoms. (05 Mar 2000) |
| optimum pH | <biochemistry> The pH at which an enzyme has maximum potency and efficiency. (09 Oct 1997) |
| optimum temperature | The temperature at which any operation, such as the culture of any special microorganism, is best carried on. (05 Mar 2000) |
| opto- | Optico- Optical; optic; ocular. Origin: G. Optikos, optical, from ops, eye (05 Mar 2000) |
| optocoelia | <anatomy> The cavity of one of the optic lobes of the brain in many animals. Origin: NL. Optocoelia, fr. Gr. Optic + a hollow. Source: Websters Dictionary (01 Mar 1998) |
| optogram | <physiology> An image of external objects fixed on the retina by the photochemical action of light on the visual purple. See Optography. Origin: Optic + -gram: cf. F. Optogramme. Source: Websters Dictionary (01 Mar 1998) |
| optography | <physiology> The production of an optogram on the retina by the photochemical action of light on the visual purple; the fixation of an image in the eye. The object so photographed shows white on a purple or red background. See Visual purple, under Visual. Origin: Optic. Source: Websters Dictionary (01 Mar 1998) |