Partake

'To partake' is often used to mean 'to eat', or 'to have some of the food', e.g. "I partook of an egg this morning." This is "to take the word beyond its proper limits" (Fowler, 1996). Properly it means 'to participate in', or 'to have a share in'. It is a formal way of saying it, and you are advised not to use it: it often seems too formal.

'To partake' is an irregular verb. Its forms are given here:

Base form	past tense	-ed participle	Remarks
partake	partook	partaken	See also take

This is one of the "the 250 or so irregular verbs" listed in Quirk 1985. The list "contains most of the irregular verbs in present-day English ... but is not meant to be exhaustive, particularly with regard to derivative verbs." AWE has copied most of the entries in that list. The verb 'to partake' belongs to Quirk's Class 4 B b.