tubulation

tu·bu·late

T0402000 (to͞o′byə-lĭt, -lāt′, tyo͞o′-) also tu·bu·lat·ed (-lā′tĭd)adj.1. Formed into or resembling a tube; tubular.2. Having a tube.
[Latin tubulātus, from tubulus, diminutive of tubus, tube.]
tu′bu·la′tion n.tu′bu·la′tor n.