AFFUSION
affusion
(noun) the act of baptizing someone by pouring water on their head
Source: WordNet® 3.1
Etymology
Noun
affusion (countable and uncountable, plural affusions)
The pouring of liquid, especially as a hydrotherapy.
A method of Christian baptism in which water is poured on the head of the person being baptized.
Usage notes
Sometimes confused with effusion (“an outpouring of liquid”).
Source: Wiktionary
Af*fu"sion, n. Etym: [Cf. F. affusion.]
Definition: The act of pouring upon, or sprinkling with a liquid, as water
upon a child in baptism. Specifically: (Med)
Definition: The act of pouring water or other fluid on the whole or a part
of the body, as a remedy in disease. Dunglison.
Source: Webster’s Unabridged Dictionary 1913 Edition