| 释义 |
rotator|rəʊˈteɪtər|
[a. L. rotātor, agent-n. from rotāre to rotate. Cf. F. rotateur.]
1. Anat. A muscle by which a limb or part can be moved circularly.
1676Wiseman Surg. Treat. vii. viii. 494 The Triceps, together with the Levidus, and the four little Rotators. 1744tr. Boerhaave's Inst. III. 254 There was no other Place where the Rotators of the Thigh could be fixed, which draw it partly outwards. 1808Barclay Muscular Mot. 389 In rolling the arm, the rotators radiad co-operate with the muscles called supinators; the rotators ulnad, with the pronators. 1893A. S. Eccles Sciatica 74 The action will only be carried to the extent possible without using the external rotators of the thigh.
attrib.1744tr. Boerhaave's Inst. III. 254 The Rotator Muscles insert their Tendons into the Protuberant Process. 1899Albutt's Syst. Med. VIII. 31 The spasmodic action shifted from one rotator muscle to another.
2. a. A thing, apparatus, part, etc., which has a rotatory motion or action.
1772Scots Mag. XXXIV. 186/2 A..machine, which he [William Kenrick] says he has contrived and denominated a Rotator. 1803Naval Chron. X. 191 The spring part..is fixed to a rotator, or revolving apparatus. 1875Bedford Sailor's Pocket Bk. v. (ed. 2) 161 The rotator [of a log] is a continuation of the part that holds the wheelwork. 1884W. H. Greenwood Steel & Iron xi. 214 In the front end of the rotator are the slag-holes. 1930Jrnl. Sci. Instruments VII. 22 It is necessary, for the purposes of wool examination, to be able..to examine the filament completely at any point by rotating it through 360°, and for this purpose a fibre rotator has been designed. 1967Stain Technol. XLII. 107 The rotator consists of a 12 inch disc to which 8 glass jars..are held firmly... It is rotated by means of a rubber belt driven by a small electric motor. 1971Sci. Amer. July 85/2 Perhaps a much more massive rotating object in the core of a galaxy could account for the existence of quasars. In these models the rotator must have a mass of about a billion solar masses. 1977Lancet 28 May 1150/2 This allows rapid separation of antibody-bound from free T3/T4 by simple inversion of the assay tubes in a rotator.
b. A device for rotating an aerial.
1959Sears, Roebuck Catal. Spring/Summer 884/2 TV Antenna Rotators... Turns antenna 360° per min. 1970Globe & Mail (Toronto) 28 Sept. 30/4 (Advt.), Al's TV, towers, color, rotator, U.H.F., Channel 17 installed. 1974Harvey & Bohlman Stereo F.M. Radio Handbk. vii. 163 For long-distance (DX) reception an aerial amplifier and/or aerial rotator are useful accessories to a high gain aerial in extracting the largest possible signal to drive the receiver into full amplitude limiting. 1977Gramophone Nov. 965/1 Feeding the tuner/amplifier from a four-element J-Beam FM aerial mounted on a rotator, it was possible to receive several continental FM stations in mid-Surrey.
3. One of the Rotatoria; a rotifer.
1876Beneden's Anim. Parasites 36 An animal..which is only an imperfectly described Rotator.
4. Math. (See quot.)
1879Thomson & Tait Nat. Phil. I. i. §345 The reciprocal of this time we shall call..the rapidity of the system, for convenience of comparison with the frequency of a vibrator or of a rotator, which is the name commonly given to the reciprocal of its period. |