ambulacrumn.

Brit.

/ˌambjᵿˈleɪkrəm/,

/ˌambjᵿˈlakrəm/, U.S.

/ˌæmbjəˈleɪkrəm/,

/ˌæmbjəˈlækrəm/

Inflections: Plural ambulacra Brit.

/ˌambjᵿˈleɪkrə/,

/ˌambjᵿˈlakrə/, U.S.

/ˌæmbjəˈleɪkrə/,

/ˌæmbjəˈlækrə/.

Origin: A borrowing from Latin. Etymon: Latin ambulacrum.

Etymology: < scientific Latin ambulacrum (1759 or earlier in Linnaeus), specific use of classical Latin ambulācrum walk, avenue < ambulāre ambulate v. + -crum , suffix forming nouns. Compare interambulacrum n.Compare French ambulacre (1501 in Middle French in the sense ‘walk, avenue’, 1787 or earlier in the zoological sense).

Zoology.

In an echinoderm: each of five elongated bands that radiate from the apex of the test (test n.² 2a), each containing a double row of pores through which the tube feet extend. Formerly also: †each of the spines of an echinoderm, considered to be locomotory (obsolete).

ΘΚΠ

the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > phylum Echinodermata > [noun] > member of > parts of > ambulacrum > pores for protrusion of tubes

ambulacrum1769

1769 J. Berkenhout Outl. Nat. Hist. Great Brit. & Ireland I. 195 [Echinus] Esculentus. Sea Hedge-hog. Shell hemispherical, bluish-red. Ten series of ambulacra or spines, with white points.

1802 C. Stewart Elements Nat. Hist. II. 350 Echinus Spatagus. Ovate and gibbous, with four depressed ambulacra.

1877 T. H. Huxley Man. Anat. Invertebrated Animals ix. 568 At its apical extremity the ambulacrum is composed of only two small ossicles which meet in the middle line.

1940 Mem. Mus. Compar. Zool. Harvard 34 200 The plates decrease rapidly in size adorally and leave small bare areas between the adjoining ambulacra close to the mouth.

2007 J. A. Vásquez in J. M. Lawrence Edible Sea Urchins (ed. 2) xii. 100 Loxechinus albus has a semispherical shell, is middle- to large-sized, green in color with reddish or purple shades in ambulacra and interambulacra of large individuals.

This entry has been updated (OED Third Edition, March 2020; most recently modified version published online December 2021).

单词	ambulacrum
释义	ambulacrumn. Brit. /ˌambjᵿˈleɪkrəm/, /ˌambjᵿˈlakrəm/, U.S. /ˌæmbjəˈleɪkrəm/, /ˌæmbjəˈlækrəm/ Inflections: Plural ambulacra Brit. /ˌambjᵿˈleɪkrə/, /ˌambjᵿˈlakrə/, U.S. /ˌæmbjəˈleɪkrə/, /ˌæmbjəˈlækrə/. Origin: A borrowing from Latin. Etymon: Latin ambulacrum. Etymology: < scientific Latin ambulacrum (1759 or earlier in Linnaeus), specific use of classical Latin ambulācrum walk, avenue < ambulāre ambulate v. + -crum , suffix forming nouns. Compare interambulacrum n.Compare French ambulacre (1501 in Middle French in the sense ‘walk, avenue’, 1787 or earlier in the zoological sense). Zoology. In an echinoderm: each of five elongated bands that radiate from the apex of the test (test n.² 2a), each containing a double row of pores through which the tube feet extend. Formerly also: †each of the spines of an echinoderm, considered to be locomotory (obsolete). ΘΚΠ the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > phylum Echinodermata > [noun] > member of > parts of > ambulacrum > pores for protrusion of tubes ambulacrum1769 1769 J. Berkenhout Outl. Nat. Hist. Great Brit. & Ireland I. 195 [Echinus] Esculentus. Sea Hedge-hog. Shell hemispherical, bluish-red. Ten series of ambulacra or spines, with white points. 1802 C. Stewart Elements Nat. Hist. II. 350 Echinus Spatagus. Ovate and gibbous, with four depressed ambulacra. 1877 T. H. Huxley Man. Anat. Invertebrated Animals ix. 568 At its apical extremity the ambulacrum is composed of only two small ossicles which meet in the middle line. 1940 Mem. Mus. Compar. Zool. Harvard 34 200 The plates decrease rapidly in size adorally and leave small bare areas between the adjoining ambulacra close to the mouth. 2007 J. A. Vásquez in J. M. Lawrence Edible Sea Urchins (ed. 2) xii. 100 Loxechinus albus has a semispherical shell, is middle- to large-sized, green in color with reddish or purple shades in ambulacra and interambulacra of large individuals. This entry has been updated (OED Third Edition, March 2020; most recently modified version published online December 2021). < n.1769
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