water pipe, aqueduct, canal (see Molina and attestations); literally, a water-road
aotontli = literally: "at the little water road", see Beyond the Codices 84/116m: 49r
1615. años. yhcuac oquipehualtico. i ye quicuauhtzotzona huey aohtli in xuchimilcopa huitz = the year 1615, was when they began to drive piles in the great canal coming from Xochimilco (central Mexico, 1615)
yquac acico yn aotli Sant Juan = was when the aqueduct reached San Juan (early seventeenth century, central New Spain)
aotli, canal, acueducto, se compone de atl, agua y otli, camino