| stage micrometre | <microscopy> A graduated scale used as a standard on the stage of a light microscope for calibrating an eyepiece micrometre, also for determining the magnification of a set-up in photomicrography, etc. (05 Aug 1998) |
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| micrometre | One-millionth of a metre, or ten to the minus sixth metre (abbreviated um), the unit used for measuring microorganisms. (09 Oct 1997) |
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| micrometre disk | <microscopy> A glass disk engraved with a suitable scale, used at the diaphragm of a micrometre ocular. The scale to be focused by the eye lens has to be seen in the field of view. Micrometre eye piece. (05 Aug 1998) |
| filar micrometre | <microscopy> An eyepiece equipped with a fiducial line in its focal plane that is movable by means of a calibrated micrometre screw in order to make accurate measurements of length. Synonym: filar eyepiece. (05 Aug 1998) |
| filar micrometre ocular | <microscopy> A micrometre ocular with crossed lines which can be simultaneously focused in and moved across the field by means of a micrometre screw. The amount of displacement can be read in 0.01 steps on the micrometre drum head. This makes a very delicate measuring device, since calibration of the micrometre scale by means of a stage micrometre gives values for each interval on the drum head which are much less than the resolving power of the highest-aperture objectives. (05 Aug 1998) |
| algid stage | The stage of collapse in cholera. (05 Mar 2000) |
| bacteria-free stage of bacterial endocarditis | Endocarditis described prior to the antibiotic era and presumably due to spontaneous healing of the bacterial vegetations. (05 Mar 2000) |
| bell stage | Third stage of tooth development, wherein the cells form the inner enamel epithelium, the stratum intermedium, the stellate reticulum, and the outer enamel epithelium; the enamel organ assumes a bell shape. (05 Mar 2000) |
| bud stage | First stage of tooth development; development of the primordia of the enamel organs, the tooth buds. (05 Mar 2000) |
| cap stage | Second stage of tooth development wherein there is development of the inner and outer enamel epithelium. (05 Mar 2000) |
| vegetative stage | The quiescent stage of a cell or its nucleus in which no karyokinetic changes are taking place. Synonym: vegetative stage. (05 Mar 2000) |
| genital stage | Referring to the psychic organization derived from, and characteristic of, the Freudian genital period of the infant's psychosocial organization. See: genitality. See: anality, orality. (05 Mar 2000) |
| mechanical stage | <microscopy> A device provided for adjusting the position of a specimen, usually by translation in two directions at right angles to each other. (05 Aug 1998) |
| REM stage sleep | <physiology> A stage of deep sleep that is accompanied by rapid eye movement and muscle paralysis. Vivid dreams can be recalled in over 80% of patients who awake from REM stage sleep. (27 Sep 1997) |
| resting stage | The quiescent stage of a cell or its nucleus in which no karyokinetic changes are taking place. Synonym: vegetative stage. (05 Mar 2000) |
| perfect stage | A mycological term used to describe the sexual life cycle phase of a fungus in which spores are formed after nuclear fusion. Synonym: teleomorph. (05 Mar 2000) |