| mirror, first or front surface | <microscopy> An optical mirror on which the reflecting surface is applied to the front surface of the mirror instead of to the back, that is, to the first surface of incidence. (05 Aug 1998) |
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| front | The position of the leading edge of the solvent in chromatography. (05 Mar 2000) |
| front lens | <physics> The front element of a compound lens system, the first lens element which the entering light encounters. See: back lens. (05 Aug 1998) |
| front-tap contraction | Contraction of the calf muscles when the anterior surface of the leg is struck. Synonym: Gowers' contraction. (05 Mar 2000) |
| front-tap reflex | Contraction of the gastrocnemius muscle when the shin is struck. Synonym: periosteal reflex. (05 Mar 2000) |