a. and sb. [mod. f. ECHIN-US + -OID.]

1

  A.  adj. Bearing a resemblance to, or having the characteristics of, an Echinus or Sea-urchin.

2

1851.  Richardson, Geol., viii. 208. The fossil species of Crinoid, Asteroid, and Echinoid radiata.

3

  B.  sb. An individual of the Order Echinoidea (Class Echinodermata), the characteristics of which are a shell composed of calcareous plates, and locomotion by suckers and spines.

4

1864.  Reader, No. 85. 204/2. Starfishes, Echinoids, or Ophiurans.

5