a. Zool. [f. Gr. καλυπτό-ς covered + βλαστός sprout, shoot.] (Hydroids) Having the generative buds provided with an external protective receptacle.
1869. Nicholson, Zool., viii. (1880), 122. The name of ‘Calyptoblastic Hydroids’ has been proposed by Professor Allman for the Sertularians and Campanularians.
