About this phrase

Turas is a masculine noun that means journey, trip, tour. It is lenited here because of the preceding simple preposition ar, meaning on.

Eolas is a masculine noun that means knowledge. It is in the genitive case here (eolais) because it is the second noun in a two-noun cluster.

Thus, ar thuras eolais (on an informational trip; literally, 'on a journey of knowledge').

Prepositional pronouns formed from the preposition ar

• orm: on me.
• ort: on you.
• air: on him; on it (masculine).
• uirthi: on her; on it (feminine).
• orainn: on us.
• oraibh: on ye (plural).
• orthu: on them.

The same prepositional pronouns' emphatic forms

• orm-sa: on me.
• ort-sa: on you.
• air-sean: on him; on it (masculine).
• uirthi-se: on her; on it (feminine).
• orainn-ne: on us.
• oraibh-se: on ye (plural).
• orthu-san: on them.