the aftermost mast of a sailing vessel.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for after mast
First the nearest hoisted her big sail, and also set one on her after-mast.Ned Garth|W. H. G. Kingston
With much difficulty we succeeded in lowering our after-mast.Journal of a Voyage from Okkak, on the Coast of Labrador, to Ungava Bay, Westward of Cape Chudleigh|Benjamin Kohlmeister and George Kmoch
Her after-mast came down, the next one came down, the others were swaying.Sonnie-Boy's People|James B. Connolly