Webster's Revised Unabridged Dictionary · 1913

Guyanese

Guyanese , adjective

1.
of or pertaining to Guyana; as, Jonestown the Guyanese capital.
2.
Of or pertaining to the inhabitants of Guyana; as, Guyanese followers of the religious cult leader died in Jonestown.

Guyanese , noun

A native or inhabitant of Guyana.