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.]
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         Cut his weasand with thy knife.          --Shak.
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