庚	899A50   61.81-9	部居	畫數  8	ㄍㄥ [geng1] .
N	(1)  The seventh character in the 天干 series of ten characters used for numbering years or itemizing persons or things, see Appendix A. (2)  Age or year in which one is born: 貴庚 (court.) may I know your age, or the year in which you were born? 庚帖 [geng1tie3]↓; 同庚 born in the same year; 年庚八字 the hour, date, month, and year of one's birth. (3)  A surname.
Words	1.庚癸 [geng1gui3], n., (AC) a secret military message asking for supplies of food and water: 呼庚呼癸 request for financial help.  2.庚信 [geng1xin4], n., (physiol.) the menses.  3.庚帖 [geng1tie3], n., (a written marriage proposal on which are stated the hour, day, month, and year of one's birth: 交換庚帖 mutual exchange of such a document by both parties concerned, constituting a formal betrothal.