The Collaborative International Dictionary of English v.0.48:

Wesil \We"sil\, n.
   See Weasand. [Obs.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Weasand \Wea"sand\, n. [OE. wesand, AS. w[=a]send; akin to
   OFries. w[=a]sende, w[=a]sande; cf. OHG. weisunt.]
   The windpipe; -- called also, formerly, wesil. [Formerly,
   written also, wesand, and wezand.]
   [1913 Webster]

         Cut his weasand with thy knife.          --Shak.
   [1913 Webster]