interstice (n.)youdaoicibaDictYouDict[interstice 词源字典]
early 15c., from Old French interstice (14c.) and directly from Latin interstitium "interval," literally "space between," from inter- "between" (see inter-) + stem of stare "to stand," from PIE root *sta- "to stand, set down, make or be firm" (see stet). Related: Interstices.[interstice etymology, interstice origin, 英语词源]