Source : Webster's Revised Unabridged Dictionary (1913)

Noontide \Noon"tide`\, n. [From noon + tide time; cf. AS.
   n?nt[=i]d the ninth hour.]
   The time of noon; midday.

Source : WordNet®

noontide
     n : the middle of the day [syn: {noon}, {twelve noon}, {high
         noon}, {midday}, {noonday}]