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Webster 1828 Edition

adv.

Speciously; plausibly; with a fair external appearance.

colorable ‎(comparative more colorable, superlative most colorable)

American standard spelling of colourable.
- 1990, Val Mallinson, The Dog Lover's Companion to the Pacific Northwest: The Inside Scoop on Where to Take Your Dog, ISBN 1598800329, page 426:
  Colorable kid menu with crayons provided for the under-21 set.