in·fuse / inˈfyoōz/ • v. [tr.] 1. fill; pervade: her work is infused with an anger born of pain and oppression. ∎  instill (a quality) in someone or something: he did his best to infuse good humor into his voice. ∎  Med. allow (a liquid) to flow into a patient, vein, etc.: saline was infused into the aorta.2. soak (tea, herbs, etc.) in liquid to extract the flavor or healing properties: infuse the dried flowers in boiling water. ∎  [intr.] (of tea, herbs, etc.) be soaked in this way: allow the mixture to infuse for 15 minutes.DERIVATIVES: in·fus·er n.

infuse pour in XV; instil; steep XVI. f. infūs-, pp. stem of L. infundere, f. IN-1 + fundere pour.
So infusion XV; concr. XVI. — (O)F. or L.

infuse (infusion) To extract the flavour from herbs, spices, etc., by steeping them in a liquid, usually by pouring boiling liquid over them, covering them and leaving them to stand without further cooking or heating, as in making tea.