The Collaborative International Dictionary of English v.0.48:

Calamint \Cal"a*mint\ (-m[i^]nt), n. [OE. calamint, calemente
   (cf. F. calament) fr. L. calamintha, Gr. kalami`nqh,
   kala`minqos. See 1st Mint.] (Bot.)
   A genus of perennial plants (Calamintha) of the Mint
   family, esp. the Calamintha Nepeta and Calamintha Acinos,
   which are called also basil thyme.
   [1913 Webster]

WordNet (r) 3.0 (2006):

calamint
    n 1: perennial aromatic herbs growing in hedgerows or scrub or
         open woodlands from western Europe to central Asia and in
         North America