胚珠 is read as はいしゅ (haishu) and means ovule.
はいしゅ
haishu
ずず
rosary
たま
ball (i.e. a testicle)
しんじゅ
pearl
じんこうしんじゅ
artificial pearls
じんぞうしんじゅ
しんえんしんじゅ
cultured pearls
しゅざん
calculation on an abacus
しゅぎょく
jewel
にっぽんしんじゅゆしゅつくみあい
Japan Pearl Exporters' Association
にっぽんしゅざんれんめい
League of Japan Abacus Associations
じゅずいちれん
a rosary
しんじゅこうたく
pearly lustre