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Echinoderm vs Bivium - What's the difference?

echinoderm | bivium |

As nouns the difference between echinoderm and bivium

is that echinoderm is any member of the Echinodermata, a group of radially symmetric, spiny-skinned marine animals. Examples of echinoderms include seastars, sea urchins, sea cucumbers, crinoids, and sand dollars while bivium is one side of an echinoderm, including a pair of ambulacra, in distinction from the opposite side ({{term|trivium|lang=en}}), which includes three ambulacra.

echinoderm

English

(wikipedia echinoderm)

Noun

(en noun)
  • Any member of the Echinodermata, a group of radially symmetric, spiny-skinned marine animals. Examples of echinoderms include seastars, sea urchins, sea cucumbers, crinoids, and sand dollars.

    • bivium

    English

    Noun

  • (zoology) One side of an echinoderm, including a pair of ambulacra, in distinction from the opposite side (trivium), which includes three ambulacra.
    • (Webster 1913) ----