Structure
What are the elements that make up this word's structure?
Another clue to this word's form, or class as a verb is the suffix <-ize>. We can add <-ize> to a noun or adjective to create verbs. To look up suffixes in Etymonline, just add a hyphen in front of it. The hyphen indicates that this element cannot appear alone, but is bound to another element. By their definition, all suffixes are bound.
Coming back to our word, we now have a hypothesis of
proselyt + ize
If you are in the UK or parts of Australia and Canada, you may use the <-ise> form of this suffix:
proselyt + ise
A few weeks ago, we investigated the word prosperity and discovered it had a prefix <pro->. Could this word have that prefix as well?
pro + selyt + ize
Like suffixes, you can look up some prefixes in Etymonline as well by placing the hyphen after the element to show that another element will come after the word. Something about that proposed base doesn't sit right with me. Could it be analyzed further? I'm thinking of words like separate and secede where the
pro + se + lyt + ise
Let's take a look at the Online Etymology Dictionary to understand the root of our word.
The entry for proselytize tells me this word is formed from proselyte + -ize. That is enough proof for the suffix that also has the form <-ise>. Let's click on the entry for proselyte.
This word, which was unfamiliar to me up to this point, is a noun for someone who "changes from one sect or creed to another." Our word first came from French, but the French form is from Latin. The story doesn't stop there, however, as Latin received this word from Greek proselytos where it literally had the orthographic denotation of "one who has come over."
Meanings drift over time. The orthographic denotation of a word is the original sense from the word's root. It may or may not have carried over into the definition of the word.
The entry continues in the second paragraph saying it is from the element eleusomai, "go; come." Let's click on the link for that first element.
Etymonline calls this a "word-forming element." The Introduction and Explanation page for Etymonline provides us with the explanations for the terms Douglas Harper, the sole author of Etymonline, uses. Word-forming element is not on there. I rarely find an Etymonline entry that directly says an element is a prefix or suffix. I just know that he provides a hyphen after the element, meaning this element will be bound to another.
This element is used to form words where it lends a sense of "toward; before." We can find it in words like prosthesis or prosody, where the
pros + elyte/ + ize
The meaning from the elements can be construed as "someone who comes forth."