Definition of placula in English:

placula

noun

Zoology
  • A disc-shaped embryo, occurring as a developmental stage in urochordates and some sponges; a hypothetical primitive metazoan resembling this.

Origin

Late 19th century. From German Plakula from ancient Greek πλάκ-, πλάξ tablet, plate + German -ula.

Pronunciation

placula

/ˈplakjʊlə/