different between sailer vs undefined

English

From Middle English sailer, sayler, saylere, equivalent to sail +? -er.

sailer (plural sailers)

That which sails; a boat.
- 1880, Thomas Hardy, The Trumpet-Major, Chapter 34,^[1]
  She is the best sailer in the service, and she carries a hundred guns.
- 1924, Herman Melville, Billy Budd, London: Constable & Co., Chapter 16,^[2]
  Elsewhere it has been said that in the lack of frigates (of course better sailers than line-of-battle ships) in the English squadron up the Straits at that period, the Indomitable was occasionally employed not only as an available substitute for a scout, but at times on detached service of more important kind.
(baseball) A fastball that skims through the air.
Obsolete form of sailor.
- 2002, Cheryl A. Fury, Tides in the Affairs of Men
  The records of Stepney parish note the burial of Henry Rainsford "an old sailer sometyme beadle of Ratclife and now a pencioner."

Alires, Israel, Isreal, Lieras, Sal Rei, ariels, railes, realis, relais, resail, serail, serial

un- +? defined

undefined (not comparable)

Lacking a definition or value.
(mathematics, computing) That does not have a meaning and is thus not assigned an interpretation.
The result of division by zero is undefined.

(lacking a definition or value): indefinite, undefinable; see also Thesaurus:indistinct or Thesaurus:vague

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