Yes, RETICULE is a Scrabble word!

Letter values in Scrabble US: R 1, E 1, T 1, I 1, C 3, U 1, L 1, E 1.

Is it a valid word?

RETICULE is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

a woman's drawstring handbag; usually made of net or beading or brocade; used in 18th and 19th centuries
a network of fine lines, dots, cross hairs, or wires in the focal plane of the eyepiece of an optical instrument