ˌ ̷ ̷ ̷ ̷ˌsīˈfōnēə noun
Usage: capitalized
Etymology: New Latin, from poly- + siphon- + -ia
: a large genus of red algae (family Rhodomelaceae) having usually a filamentous much-branched thallus variable in shape and size but in cross section showing a single axial cell surrounded by a sheath of tubular cells at least in the axis and main branches