purple sea urchin
noun
Any of several sea urchins with purple or purple-tipped spines, especially Paracentrotus lividus of the east Atlantic, Arbacia punctulata of the west Atlantic, andStrongylocentrotus purpuratus of the east Pacific.
Origin
Late 19th century.
- retina
- retinacular
- retinaculum
- retinal
- retinaldehyde
- retinal detachment
- retinal image
- retinalite
- retinally
- retinal scanner
- retinene
- retinispora
- retinite
- retinitis
- retinitis pigmentosa
- retinker
- retinoate
- retinoblastoma
- retinocerebral
- retinochoroidal
- retinochoroiditis
- retinoic acid
- retinoid
- retinol
- retinomotor