Diaphragm pump, one in which a flexible diaphragm takes the place of a piston.

(Di`a*phrag*mat"ic) a. [Cf. F. diaphragmatique.] Pertaining to a diaphragm; as, diaphragmatic respiration; the diaphragmatic arteries and nerves.

(Di*aph"y*sis) n. [Gr. a growing through; dia` through + to bring forth.]

1. (Bot.) An abnormal prolongation of the axis of inflorescence.

2. (Anat.) The shaft, or main part, of a bone, which is first ossified.

(Di`ap*no"ic) a. [Gr. outlet for the wind, exhalation, fr. to blow through; dia` through + to blow, breathe: cf. F. diapnoïque.] (Med.) Slightly increasing an insensible perspiration; mildly diaphoretic. n. A gentle diaphoretic.

(Di*ap`o*phys"ic*al) a. (Anat.) Pertaining to a diapophysis.

(||Di`a*poph"y*sis) n. [NL. See Dia-, and Apophysis.] (Anat.) The dorsal transverse, or tubercular, process of a vertebra. See Vertebra.

(Di"arch*y) n. [Gr. di- = di`s- twice + to rule.] A form of government in which the supreme power is vested in two persons.

(Di*a"ri*al Di*a"ri*an) a. [See Diary.] Pertaining to a diary; daily.

(Di"a*rist) n. One who keeps a diary.

(Di`ar*rhe"a, Di`ar*rhœ"a), n. [L. diarrhoea, Gr. dia`rroia, fr. dia`rrei^n to flow through; dia` + "rei^n to flow; akin to E. stream. See Stream.] (Med.) A morbidly frequent and profuse discharge of loose or fluid evacuations from the intestines, without tenesmus; a purging or looseness of the bowels; a flux.

(Di`a*pho*ret"ic Di`a*pho*ret"ic*al) a. [L. diaphoreticus, Gr. : cf. F. diaphorétique. See Diaphoresis.] Having the power to increase perspiration.

(Di`a*pho*ret"ic), n. (Med.) A medicine or agent which promotes perspiration.

Diaphoretics differ from sudorifics; the former only increase the insensible perspiration, the latter excite the sensible discharge called sweat. Parr.

(Di"a*phote) n. [Pref. dia- + Gr. light.] (Elec.) An instrument designed for transmitting pictures by telegraph. Fallows.

(Di"a*phragm) n. [L. diaphragma, Gr. fr. to fence by a partition wall; dia` through + to fence, inclose; prob. akin to L. fareire to stuff: cf. F. diaphragme. See Farce.]

1. A dividing membrane or thin partition, commonly with an opening through it.

2. (Anat.) The muscular and tendinous partition separating the cavity of the chest from that of the abdomen; the midriff.

3. (Zoöl.) A calcareous plate which divides the cavity of certain shells into two parts.

4. (Opt.) A plate with an opening, which is generally circular, used in instruments to cut off marginal portions of a beam of light, as at the focus of a telescope.

5. (Mach.) A partition in any compartment, for various purposes.

  By PanEris using Melati.

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