(ornithology) A small projection of three or four feathers on the first digit of the wing on some birds.

Severance of a physical connection. / Unexpected termination of a telephone connection. / Absence of rapport; the nonexistence of, or a breakdown of, effective communication.

Secure against attack; impregnable. / (by extension) Undeniable, incontestable or incontrovertible.

plural of archmould