gill slitn.

Brit.

/ˈɡɪl slɪt/, U.S.

/ˈɡɪl ˌslɪt/

Origin: Formed within English, by compounding. Etymons: gill n.¹, slit n.

Etymology: < gill n.¹ + slit n.

In aquatic organisms: a narrow or elongated opening through which water passes over a gill; spec. (in chordates) each of the apertures in the pharyngeal wall through which water passes to the gills on either side; (in cartilaginous fishes also) each of the series of narrow apertures by which the gills open to the exterior. Also: each of the grooves or openings in the pharynx which represent or are homologous with these during the early embryonic development of all chordates, including higher vertebrates (cf. gill pouch n. 2).The gill slits of bony fishes are concealed by the operculum. Cf. gill cleft n. at gill n.¹ Compounds 3, gill fissure n. at gill n.¹ Compounds 3.

ΚΠ

1851 J. E. Gray List Specimens Brit. Animals Brit. Mus.: Fish 39 Isurina.—Gill-slits all before the pectorals; second dorsal opposite the anal.

1854 R. Owen Struct. Skeleton & Teeth in Orr's Circle Sci.: Org. Nature I. 173 The two vertical fissures behind are called ‘gill-slits’, or branchial or opercular apertures.

1876 Chambers's Jrnl. 13 736/1 Any one who has watched a pike or trout in pursuit of its prey, will have noticed how widely it has stretched its gill slits, so as to let the water flow off as freely as possible on all sides.

1887 A. C. Haddon Introd. Study Embryol. v. 110 Dohrn and his school believe that the stomodæum is a new formation possibly corresponding to a pair of fused gill-slits.

1954 F. C. Lane All about Insect World 53 These [dragonfly nymphs] breathe through gill slits like fish.

1979 E. J. W. Barrington in M. H. Wake Hyman's Compar. Vertebr. Anat. (ed. 3) iii. 59 The gill slits do not open directly to the outside in most enteropneusts; instead, each leads into a pouch, the gill sac, that opens externally by the gill pore.

2000 C. Tudge Variety of Life ii. xiv. 365 There are just five species of saw sharks in two genera, one of them, Pristiophorus, with five gill slits and the other, Pliotrema, with six.

2014 A. Roberts Incredible Unlikeliness of Being 40 Similar genes are expressed on the inner surface of the developing gill slits in chordates and acorn worms: these gill slits really are homologous.

This entry has been updated (OED Third Edition, December 2018; most recently modified version published online March 2022).

单词	gill slit
释义	gill slitn. Brit. /ˈɡɪl slɪt/, U.S. /ˈɡɪl ˌslɪt/ Origin: Formed within English, by compounding. Etymons: gill n.¹, slit n. Etymology: < gill n.¹ + slit n. In aquatic organisms: a narrow or elongated opening through which water passes over a gill; spec. (in chordates) each of the apertures in the pharyngeal wall through which water passes to the gills on either side; (in cartilaginous fishes also) each of the series of narrow apertures by which the gills open to the exterior. Also: each of the grooves or openings in the pharynx which represent or are homologous with these during the early embryonic development of all chordates, including higher vertebrates (cf. gill pouch n. 2).The gill slits of bony fishes are concealed by the operculum. Cf. gill cleft n. at gill n.¹ Compounds 3, gill fissure n. at gill n.¹ Compounds 3. ΚΠ 1851 J. E. Gray List Specimens Brit. Animals Brit. Mus.: Fish 39 Isurina.—Gill-slits all before the pectorals; second dorsal opposite the anal. 1854 R. Owen Struct. Skeleton & Teeth in Orr's Circle Sci.: Org. Nature I. 173 The two vertical fissures behind are called ‘gill-slits’, or branchial or opercular apertures. 1876 Chambers's Jrnl. 13 736/1 Any one who has watched a pike or trout in pursuit of its prey, will have noticed how widely it has stretched its gill slits, so as to let the water flow off as freely as possible on all sides. 1887 A. C. Haddon Introd. Study Embryol. v. 110 Dohrn and his school believe that the stomodæum is a new formation possibly corresponding to a pair of fused gill-slits. 1954 F. C. Lane All about Insect World 53 These [dragonfly nymphs] breathe through gill slits like fish. 1979 E. J. W. Barrington in M. H. Wake Hyman's Compar. Vertebr. Anat. (ed. 3) iii. 59 The gill slits do not open directly to the outside in most enteropneusts; instead, each leads into a pouch, the gill sac, that opens externally by the gill pore. 2000 C. Tudge Variety of Life ii. xiv. 365 There are just five species of saw sharks in two genera, one of them, Pristiophorus, with five gill slits and the other, Pliotrema, with six. 2014 A. Roberts Incredible Unlikeliness of Being 40 Similar genes are expressed on the inner surface of the developing gill slits in chordates and acorn worms: these gill slits really are homologous. This entry has been updated (OED Third Edition, December 2018; most recently modified version published online March 2022). < n.1851
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