Definify.com

Webster 1913 Edition

Adj.

[L.

ruber

red +

-form

Having the nature or quality of red;

as, the

rubiform

rays of the sun

[R.]

Sir I. newton.

Noun.

[L. ruber, red, and form.] Having the form of red; as, the rubiform rays of the sun are least refrangible.

rubiform ‎(comparative more rubiform, superlative most rubiform)

Having the nature or quality of red.
The rubiform rays of the sun — Sir Isaac Newton.