Possible misspelling? More dictionaries have definitions for
actinal
-- could that be what you meant?
a convex lens is not always larger
First, you should realize that the image formed by a convex lens is not always larger than the object. — from Common Science by Carleton Washburne
This tab, called Hiding in Plain Sight,
shows you passages from notable books where your word is accidentally (or perhaps deliberately?)
spelled out by the first letters of consecutive words.
Why would you care to know such a thing? It's not entirely clear to us, either, but
it's fun to explore! What's the longest hidden word you can find? Where is your name hiding?