The two crossword solutions for the term 'round midnight' are 'laten' and 'strat'. 'Laten' is an Old English word meaning 'to delay or put off'. It is related to the modern English word 'LATE'. 'Strat' is an abbreviation of the word 'STRATUM', which is a layer of sedimentary rock or soil. Together, these two words describe the time around midnight, when the day is transitioning from LATE night to early morning.