極きょく体たいMeanings1nounpolar bodyA small cell formed during oocyte meiosis, containing little cytoplasm and eventually degenerating. Used in biology and embryology.卵らん母ぼ細さい胞ぼうの減げん数すう分ぶん裂れつで極きょく体たいが放ほう出しゅつされる。Polar bodies are extruded during the meiotic division of the oocyte.