redia

[ ree-dee-uh ]

noun

, Zoology.

, plural re·di·ae [ree, -dee-ee].

1. a cylindrical larval stage of some trematodes, produced by a sporocyst and giving rise to daughter rediae or to cercariae.

redia

/ ˈriːdɪə /

noun

1. a parasitic larva of flukes that has simple locomotory organs, pharynx, and intestine and gives rise either to other rediae or to a different larva (the cercaria)

Word History and Origins

Origin of redia¹

First recorded in 1875–80; from New Latin, after Italian biologist F. Redi; -a ²

Word History and Origins

Origin of redia¹

C19: from New Latin, named after Francesco Redi (1629–97), Italian naturalist

Example Sentences

Spō′rosac, one of the gonophores of certain hydrozoans in which the medusoid structure is not developed: a redia or spiro-cyst, in Vermes; Sporostē′gium, the so-called fruit of plants in the Charace�, consisting of the hard brownish spirally-twisted shell or covering of the spore.—adjs.

From Project Gutenberg

Redia, rē′di-a, n. a stage in some trematode worms immediately before cercaria:—pl.

From Project Gutenberg

The period of development varies from ten to twenty weeks; each sporocyst may give rise to from five to eight redia and each redia to from twelve to twenty cercaria.

From Project Gutenberg

The sporocyst, as it is now called, develops into a third generation known as redia which escape from the cyst.

From Project Gutenberg

The daughter redia or cercaria, as they are now termed, leave the body of the snail and finally become encysted on the stems of grass, cresses and weeds.

From Project Gutenberg