The Collaborative International Dictionary of English v.0.48:

Col- \Col-\
   A prefix signifying with, together. See Com-.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Col \Col\, n. [F., neck, fr. L. collum neck.]
   A short ridge connecting two higher elevations or mountains;
   the pass over such a ridge.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

80 Moby Thesaurus words for "col":
   abysm, abyss, arroyo, box canyon, breach, break, canyon, cavity,
   chap, chasm, check, chimney, chine, chink, cleft, cleuch, clough,
   comb, coulee, couloir, crack, cranny, crevasse, crevice, cut, cwm,
   defile, dell, dike, ditch, donga, draw, esker, excavation, fault,
   fissure, flaw, flume, fracture, furrow, gap, gape, gash, gorge,
   groove, gulch, gulf, gully, hogback, hole, horseback, incision,
   joint, kame, kloof, leak, moat, notch, nullah, opening, pass,
   passage, ravine, rent, ridge, rift, rime, rupture, saddle,
   saddleback, scissure, seam, slit, slot, spine, split, trench,
   valley, void, wadi



V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

COL
       Caldera Open Linux (Caldera, Linux)