what is the longest word that you

A- can spell (without looking it up)

B- know what it means

and C- can actually say it without getting tung tied.

mine is

hydrocephalus

people are often amazed I can say it- a friend of mine keeps forgetting the word too.

anything else I need to look up if I want to use it

or I'll just find a shorter, lless exhausting word that I can use