1) Alimentary canal 2) Alimentary tract 3) Begin 4) Begin as an adventure 5) Digestive tract 6) Digestive tube 7) Embryonic system 8) Gastrointestinal tract 9) Gi tract 10) Set about 11) Start as an adventure 12) Start to rent one 13) The alimentary canal 14) The digestive tract Found on https://www.crosswordclues.com/clue/enteron
(from the article `medusa`) ...The medusoid body is bell- or umbrella-shaped. Hanging downward from the centre is a stalklike structure, the manubrium, bearing the mouth at its ... Found on http://www.britannica.com/eb/a-z/e/33
En'te·ron noun [ New Latin , from Greek 'e`nteron an intestine, from 'ento`s within.] (Anat.) The whole alimentary, or enteric, canal. Found on http://www.encyclo.co.uk/webster/E/47