Definition of ambulacrum in English:

ambulacrum

nounPlural ambulacraˌambjʊˈlakrəmˌambjʊˈleɪkrəmˌambyəˈlakrəm

Zoology

(in an echinoderm) each of the radially arranged bands, together with their underlying structures, through which the double rows of tube feet protrude.
〔动〕（棘皮动物）步带
Example sentencesExamples
- Although there are ridges on the radial plates that underlie the most distal points of the ambulacra, they did not support recumbent ambulacra as shown by growth lines crossing these ridges.
- Four different groups of blastoids with moderately wide ambulacra evolved from groups with narrow ambulacra.
- Food particles were transported along the radial ducts, which penetrate through the marginals, to ambulacra on the underside of the disc, and eventually to the central mouth.
- It is contained by four rows of plates with the plates smaller along the dorsal side, probably indicating an ambulacrum.
- Furthermore, the placement of the ambulacra relative to the radials appears to be incorrect.

Derivatives

ambulacral

adjective

Zoology

Paul follows Kesling in the ambulacral placement.
Example sentencesExamples
- In asteroids, the ambulacrals arch to form a deep ambulacral groove.
- The longest ambulacral column is parallel and adjacent to the ambulacral-adambulacral furrow.
- Its wide ambulacral grooves and open filtration fan made it adapted for motile particle capture in a wide variety of environments.
- The ambulacral grooves are narrow and the ambulacral ossicles are not exposed.

Origin

Early 19th century: Latin, 'avenue', from ambulare 'to walk'.

Definition of ambulacrum in US English:

ambulacrum

nounˌambyəˈlakrəm

Zoology

(in a starfish or other echinoderm) each of the radially arranged bands, together with their underlying structures, through which the double rows of tube feet protrude.
〔动〕（棘皮动物）步带
Example sentencesExamples
- Food particles were transported along the radial ducts, which penetrate through the marginals, to ambulacra on the underside of the disc, and eventually to the central mouth.
- Four different groups of blastoids with moderately wide ambulacra evolved from groups with narrow ambulacra.
- Although there are ridges on the radial plates that underlie the most distal points of the ambulacra, they did not support recumbent ambulacra as shown by growth lines crossing these ridges.
- It is contained by four rows of plates with the plates smaller along the dorsal side, probably indicating an ambulacrum.
- Furthermore, the placement of the ambulacra relative to the radials appears to be incorrect.

Origin

Early 19th century: Latin, ‘avenue’, from ambulare ‘to walk’.

单词	ambulacrum
释义	Definition of ambulacrum in English: ambulacrum nounPlural ambulacraˌambjʊˈlakrəmˌambjʊˈleɪkrəmˌambyəˈlakrəm Zoology (in an echinoderm) each of the radially arranged bands, together with their underlying structures, through which the double rows of tube feet protrude. 〔动〕（棘皮动物）步带 Example sentencesExamples Although there are ridges on the radial plates that underlie the most distal points of the ambulacra, they did not support recumbent ambulacra as shown by growth lines crossing these ridges. Four different groups of blastoids with moderately wide ambulacra evolved from groups with narrow ambulacra. Food particles were transported along the radial ducts, which penetrate through the marginals, to ambulacra on the underside of the disc, and eventually to the central mouth. It is contained by four rows of plates with the plates smaller along the dorsal side, probably indicating an ambulacrum. Furthermore, the placement of the ambulacra relative to the radials appears to be incorrect. Derivatives ambulacral adjective Zoology Paul follows Kesling in the ambulacral placement. Example sentencesExamples In asteroids, the ambulacrals arch to form a deep ambulacral groove. The longest ambulacral column is parallel and adjacent to the ambulacral-adambulacral furrow. Its wide ambulacral grooves and open filtration fan made it adapted for motile particle capture in a wide variety of environments. The ambulacral grooves are narrow and the ambulacral ossicles are not exposed. Origin Early 19th century: Latin, 'avenue', from ambulare 'to walk'. Definition of ambulacrum in US English: ambulacrum nounˌambyəˈlakrəm Zoology (in a starfish or other echinoderm) each of the radially arranged bands, together with their underlying structures, through which the double rows of tube feet protrude. 〔动〕（棘皮动物）步带 Example sentencesExamples Food particles were transported along the radial ducts, which penetrate through the marginals, to ambulacra on the underside of the disc, and eventually to the central mouth. Four different groups of blastoids with moderately wide ambulacra evolved from groups with narrow ambulacra. Although there are ridges on the radial plates that underlie the most distal points of the ambulacra, they did not support recumbent ambulacra as shown by growth lines crossing these ridges. It is contained by four rows of plates with the plates smaller along the dorsal side, probably indicating an ambulacrum. Furthermore, the placement of the ambulacra relative to the radials appears to be incorrect. Origin Early 19th century: Latin, ‘avenue’, from ambulare ‘to walk’.
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