| plano | <microscopy> In optics, an optical surface which has been made substantially flat, the degree of flatness depending upon the performance required. A plano-convex lens is a positive lens with one surface flat and the other convex. In the dictionary, plano is given only as a combining form, but in practical optics it is often used alone to denote any particularly flat surface-- that has been worked flat. See: optical flat. Origin: L. Planus. (04 Mar 1998) |
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| planoblast | <zoology> Any free-swimming gonophore of a hydroid; a hydroid medusa. Origin: Gr. To wander. Source: Websters Dictionary (01 Mar 1998) |
| planocellular | Relating to or composed of flat cells. Origin: L. Planus, flat, + cellular (05 Mar 2000) |
| planoconcave | <optics> Flat on one side and concave on the other, usually denoting a lens of that shape. Source: Websters Dictionary (21 Jun 2000) |
| planoconvex | <optics> Flat on one side and convex on the other, usually denoting a lens of that shape. (21 Jun 2000) |
| planography | <procedure, radiology> The recording of internal body images at a predetermined plane by means of the tomograph, also called body section roentgenography. Origin: Gr. Graphein = to write (18 Nov 1997) |
| planomania | <psychiatry> The morbid impulse to leave home and discard social restraints. Origin: G. Planos, wandering, + mania, frenzy (05 Mar 2000) |
| planometry | <mechanics> The art or process of producing or gauging a plane surface. Source: Websters Dictionary (01 Mar 1998) |
| planorbis | <marine biology> Any fresh water air-breathing mollusk belonging to Planorbis and other allied genera, having shells of a discoidal form. Origin: NL, fr. L. Planus flat + orbis a circle. (19 Mar 1998) |
| planoscopic eyepiece | <microscopy> An American Optical Company (Reichert) eyepiece designed to flatten the field of achromatic objectives. (05 Aug 1998) |
| planotopokinesia | Loss of orientation in space. Origin: G. Planos, wandering, + topos, place, + kinesis, motion (05 Mar 2000) |
| planovalgus | A condition in which the longitudinal arch of the foot is flattened and everted. Origin: plano-+ L. Valgus, turned outward (05 Mar 2000) |