reia

Bingham: Hiram Bingham, A Gilbertese-English Dictionary (1908, 1953). American Board of Commissioners for Foreign Missions.
Sabatier: Ernest Sabatier, M.S.C., Dictionnaire Gilbertin-Français (1954), translated by Sr. M. Oliva as Gilbertese-English Dictionary (1971). South Pacific Commission Publications Bureau.

Bingham

réia

n. a grove, a cluster of trees or plants.

va. clustered.

reia

n. a clump of trees or plants (larger than kiboa), grove, thicket, bosket, plantation.