ventage

noun

1. (countable)A puff of air coming through a hole in a wind instrument.

   “Govern these ventages with your fingers and thumb, give it breath with your mouth, and it will discourse most eloquent music.”

2. (countable, uncountable)Venting (the act by which something is vented)

   “In some Madras examples which have been successful, the ventage in the under-sluices is about the same as that in the head-sluices above them.”

   “The most important factor in casting solid, close-grained slugs suitable for withstanding pressure in direct printing is efficient ventage of air from the mold each time a slug is cast.”