Define thermionic. thermionic synonyms, thermionic pronunciation, thermionic translation, English dictionary definition of thermionic. n. An electrically charged particle, especially an electron, emitted by a conducting material at high temperatures. thermâ²iÂ·onâ²ic adj. adj of, relating to,...
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HCG stands for Human Chorionic Gonadotropin, the pregnancy hormone. HCG is being produced by the placenta and enters the blood stream as soon as implantation happens, about one week after fertilization and ovulation, when the embryo implants and the placenta attaches to the uterine lining. Leslie Garcia.