ˈtətsən noun
( -s )
Etymology: Middle English totsane, toutsayne, from (assumed) Middle French toute-saine (whence French), from toute (feminine of tout all, from — assumed — Vulgar Latin i tottus, alteration of Latin totus ) + saine, feminine of sain healthy, from Latin sanus healthy, sane
: a Eurasian St.-John's-wort ( Hypericum androsaemum ) from which a healing salve is made in Spain