argha (Sanskrit). A type of offering used in tantric rituals, often comprising of water mixed with flowers, leaves, and rice.

A Dictionary of Buddhism, Oxford University Press, 2003, 2004 (which is available in electronic version from answer.com)

argha m. (√arh), worth, value, price, Mn Yājñ
• (often ifc., cf. dhanârghá, mahârgha, śatârghá), sahasrârghá)
• (ás), m. respectful reception of a guest (by the offering of rice durva-grass, flowers, or often only of water) ŚBr. xiv, &c. (often confounded with arghya, q.v.)
• a collection of twenty pearls (having the weight of a Dharaṇa) VarBṛS

Sanskrit-English Dictionary, by M. Monier William