Rath \Rath\, n. [Ir. rath.]

1. A hill or mound. [Ireland] --Spencer.

2. A kind of ancient fortification found in Ireland.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Rath \Rath\, Rathe \Rathe\, a. [AS. hr[ae][eth], hr[ae]d, quick, akin to OHG. hrad, Icel. hra[eth]r.]

Coming before others, or before the usual time; early. [Obs. or Poetic]

Bring the rathe primrose that forsaken dies. --Milton.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Rath \Rath\, Rathe \Rathe\, adv. Early; soon; betimes. [Obs. or Poetic]

Why rise ye up so rathe? --Chaucer.

Too rathe cut off by practice criminal. --Spencer.

Source: Webster's Revised Unabridged Dictionary (1913)