| 释义 |
‖ pollex Anat.|ˈpɒlɛks|
Pl. pollices |-ɪsiːz|.
[Lat., = thumb, also great toe.]
1. The innermost digit of the fore limb in air-breathing vertebrates; in man, etc., the thumb. Sometimes used to include the corresponding digit of the hind limb (the great toe), distinctively called hallux.
1835–6Todd's Cycl. Anat. I. 571/2 The pollex in the great whale has two bones. 1854Owen Skel. & Teeth in Orr's Circ. Sc. I. Org. Nat. 231 The pollex, or the first digit, exceeds the third..in length. 1872Mivart Elem. Anat. iv. (1873) 174 When a digit is wanting it is generally the pollex, as in spider monkeys. 1897Parker & Haswell Text-bk. Zool. II. xiii. 77 The first digit of the fore-limb is distinguished as the pollex or thumb. 1909W. Bateson Mendel's Princ. Heredity xii. 213 The case is more probably to be regarded as a homoeotic variation of the digits into the likeness of the hallux and pollex. 1959[see alula 1]. 1971A. Burgess MF xv. 169 She clutched her bag between index and pollex. 1975Nature 17 Jan. 192/1 Proteles differs from Hyaena principally in having a dentition much reduced in size, and in retaining the pollex (a digit lost in both Hyaena and Crocuta).
2. Zool. The movable part of the forceps in some crustaceans.
1895F. H. Herrick Amer. Lobster ix. 147 The pollux [sic] is depressed, so that when the claw is closed it falls almost exactly midway between the normal and first superadded digit. 1904Biol. Bull. VI. 75 The added structure [of an aberrant limb of a crayfish] is..a movable piece with two immobile prongs that otherwise resemble the index and pollex of a forceps. |