What are general rules of thumb for creating adjectives with -able? I wanted to denote an object as having an ability to be tiled, but "tileable" and "tilable" both yielded as incorrect words by spell check and standard English dictionary used by Mac OS X dictionary widget. Is "tileable" or "tilable" a correct word/form for denoting an object having an ability to be tiled?
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The way I see it, you've got two choices here if the word doesn't already have an acceptable -able suffix counterpart. Either
Although, Googling it, 'tileable' seems to be pretty widely used anyway.
As the NOAD reports, -able is a suffix forming adjectives meaning:
The meaning of tile-able would be to be able to be tiled.
The spelling checker I am using reports the word as wrong, but it suggests also tile-able.
The Oxford Dictionary of American Usage and Style by Bryan A. Garner has a helpful list under ‑able, including the choice between ‑able and ‑ible, attaching ‑able to nouns, to intransitive verbs, converting ‑ate verbs into ‑able adjectives, and even on dropping or retaining the medial ‑e‑.
Survey of English Spelling by Edward Carney explains some etymological (source language) factors of the “spelling problem”.