Definition

1. Noun:
   • Superfetation: In biology and medicine, "bội thụ tinh" refers to the fertilization of a second ovum after a pregnancy has already begun, leading to the development of two fetuses of different gestational ages within the same uterus.
   • Superfecundation: More broadly, it can also refer to the fertilization of two or more ova released during the same menstrual cycle by sperm from separate acts of sexual intercourse.

Usage Examples

• Noun:
  • Bội thụ tinh là một hiện tượng hiếm gặp ở người. (Superfetation is a rare phenomenon in humans.)
  • Các nhà khoa học đang nghiên cứu một trường hợp bội thụ tinh ở động vật. (Scientists are studying a case of superfecundation in animals.)

Advanced Usage

• "Hiện tượng bội thụ tinh": The phenomenon of superfetation/superfecundation.
  • Hiện tượng bội thụ tinh đã được ghi nhận trong y văn. (The phenomenon of superfetation has been documented in medical literature.)

Variants and Related Words

• Thụ tinh (verb/noun): To fertilize / fertilization.
  • Thụ tinh trong ống nghiệm (In vitro fertilization).
• Song thai (noun): Twins.
• Đa thai (noun): Multiple pregnancy.

Synonyms

• Superfecundation (in English): The fertilization of two or more ova from the same cycle by sperm from separate acts.
• Superfetation (in English): The fertilization and implantation of a second ovum after a pregnancy is established.

Notes on Meaning

• The term "bội thụ tinh" is a specialized scientific term. In common, non-scientific language, the concept is often described rather than named directly.
• The two primary English equivalents, "superfetation" and "superfecundation," are distinct but related concepts. "Bội thụ tinh" can sometimes be used to encompass both, with context clarifying the specific meaning.