planoblast Zool.
(ˈplænəʊblæst)
[f. plano-2 + Gr. βλαστ-ός sprout, shoot.]
The free-swimming generative bud or gonophore of certain Hydrozoa, usually a craspedote medusa or medusoid. Hence planoˈblastic a., of or pertaining to a planoblast.
| 1871 Allman Monogr. Gymnoblastic Hydroids I. Introd. 15 Planoblast... A generative bud with a structure fitting it for a free locomotive life when detached from the hydrosome. Ibid., Umbrella, the gelatinous bell of a medusiform planoblast. |