@andrewt It's the prefix col- which sometimes occurs in latin-derived words instead of co- or com- with base words that begin with an 'l'. You see it in "collateral" and "colloquial" and even in "college" and "collegial." That said, I think the one-l version, "colinear" is widely accepted as correct these days.
@jsiehler Oh, cool, I had properly no idea. Never occured to me that 'coll-' words were a family, much less part of one I knew, but it makes a lot of sense now.
Still aesthetically not a fan of 'collinear' but maybe it will grow on me.
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