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?
As the NOAD reports, -able is a suffix forming adjectives meaning:
- able to be: calculable.
- due to be: payable.
- subject to: taxable.
- relevant to or in accordance with: fashionable.
- having the quality to: suitable, comfortable.
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.
As reported in Common Sense (ISBN 13: 978-0-312-34255-5; ISBN 10: 0-312-34255-1), a book about punctuation marks, a hyphen is used in words consisting of a prefix and a root, if not using one will cause to run together either two vowels or a small letter and a capital.
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”.