separative

Serving to separate.

[…] that much more full and eminent Experiment of the Separative Virtue of extream Cold, that was made, against their Wills, by the […] Dutch men that Winter’d in Nova Zembla;

We have hitherto only observed the colouring substance itself, we ought now to consider the preparation of the ground which receives it: to inquire how it comes that every object hath this separative power over the particles of light; how it imbibes one colour, while it copiously reflects another?

Tending to keep oneself separate from others.

Pye had never forgotten or forgiven the ingenious fraud. It had taught him secretiveness, made him even more lone and separative. He had withdrawn from the world of men, academic and otherwise.

I was working hard, and living a rather separative existence, without realizing at the time what this aloofness meant for me.

Something that serves to separate.

1853, A. F. Lendy, The Principles of War, London: Parker, Furnivall, and Parker, “Strategy,” Chapter 4, p. 117, […] as for the distance between [the roads], it varies according to the strength of the army and the nature of the ground, the essential point being not to leave between them obstacles acting as separatives, such as rivers, &c.

He […] independently identified the oblique wedge as a separative of words [in cuneiform writing] […]