Can you help me solve a mystery

I've checked every reference book known to man (Oxford English Dictionary/Roget's etc) but have had no luck as to why the word 'Gullible' is not, officially, a word. Has it evolved by word of mouth, as many 'street' words do, but has somehow avoided the official endorsement of the printed word. Just wondering.....
What about this:

1793 (implied in gullibility), earlier cullibility (1728), probably connected to gull, a cant term for "dupe, sucker" (1594), which is of uncertain origin. It is perhaps from the bird (see gull (n.)), or from verb gull "to swallow" (1530, from O.Fr. goule, from L. gula "throat," see gullet); in either case with a sense of "someone who will swallow anything thrown at him." Another possibility is M.E. dial. gull "newly hatched bird" (1382), which is perhaps from O.N. golr "yellow," from the hue of its down.

Online Etymology Dictionary, © 2001 Douglas Harper
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