ˈ ̷ ̷ ̷ ̷ˌtak noun
( -s )
Etymology: is- + -tac (from Greek takēnai to melt, be dissolved, passive aor. infin. of tēkein to melt, dissolve) — more at thaw
: an equiglacial line on a map or chart connecting points where ice melts at the same time in spring