Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
windage is a noun meaning "the retarding force of air friction on a moving object". It carries 4 recorded senses.
the retarding force of air friction on a moving object
the space between the projectile of a smoothbore gun and the surface of the bore of the gun
exposure to the wind (as the exposed part of a vessel's hull which is responsible for wind resistance)
the deflection of a projectile resulting from the effects of wind
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for windage come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.