資料來源 : pyDict

前核,生殖核

資料來源 : Webster's Revised Unabridged Dictionary (1913)

Pronucleus \Pro*nu"cle*us\, n.; pl. {Pronuclei} (-[imac]). [NL.
   See {Pro-}, and {Nucleus}.] (Biol.)
   One of the two bodies or nuclei (called male and female
   pronuclei) which unite to form the first segmentation nucleus
   of an impregnated ovum.

   Note: In the maturing of the ovum preparatory to
         impregnation, a part of the germinal vesicle (see
         {Polar body}, under {Polar}) becomes converted into a
         number of small vesicles, which aggregate themselves
         into a single clear nucleus. which travels towards the
         center of the egg and is called the female pronucleus.
         In impregnation, the spermatozo["o]n which enters the
         egg soon loses its tail, while the head forms a
         nucleus, called the male pronucleus, which gradually
         travels towards the female pronucleus and eventually
         fuses with it, forming the first segmentation nucleus.

資料來源 : WordNet®

pronucleus
     n : the nucleus of the ovum or sperm after fertilization but
         before they fuse to form the nucleus of the zygote
     [also: {pronuclei} (pl)]