Begin, as an adventure

• The alimentary canal (especially of an embryo or a coelenterate)
• Alimentary canal
• Begin, as an enterprise
• "Begin, as an enterprise"
• Set about
• Start, as an adventure
• Begin as an adventure

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Enteron \En"te*ron\, n. [NL., fr. Gr. 'e`nteron an intestine, fr. 'ento`s within.] (Anat.) The whole alimentary, or enteric, canal.

Wiktionary Word definitions in Wiktionary
n. The gut, the whole intestine (alimentary) canal