Defn: The embryo which has begun its development in the act of germination.
PLANULA
Plan"u*la, n.; pl. Planulæ. Etym: [L., a little plane.]
1. (Biol.)
Defn: In embryonic development, a vesicle filled with fluid, formed from the morula by the divergence of its cells in such a manner as to give rise to a central space, around which the cells arrange themselves as an envelope; an embryonic form intermediate between the morula and gastrula. Sometimes used as synonymous with gastrula.
2. (Zoöl.)
Defn: The very young, free-swimming larva of the coelenterates. It usually has a flattened oval or oblong form, and is entirely covered with cilia.
PLANXTY
Planx"ty, n. Etym: [Cf. L. plangere to mourn aloud.] (Mus.)
Defn: An Irish or Welsh melody for the harp, sometimes of a mournful character.
PLAQUE
Plaque, n. Etym: [F. Cf. Plack, and see Placard.]
Defn: Any flat, thin piece of metal, clay, ivory, or the like, used for ornament, or for painting pictures upon, as a slab, plate, dish, or the like, hung upon a wall; also, a smaller decoration worn on the person, as a brooch.