Avenseguim

Type: Charm
Pronunciation: ah-ven-SEH-gwim
Description: Turns an object into a tracking device.
Seen/Mentioned: In 1927, Newton Scamander used this spell to track the origins of a feather - a clue found during his search for Porpentina Goldstein - back to Yusuf Kama, whose hat the feather came from.
Etymology: The incantation Avenseguim is likely derived from the portmanteau of avens, a Latin adjective for "eager" or "craving", and seguir, the Spanish and Portuguese verb meaning "to follow", or alternatively from the Catalan seguim, meaning "we follow". Taken together, Avenseguim can be interpreted as "to eagerly follow", which aptly characterises the behaviour of a tracking device.