Etymology
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-scope 
word-forming element indicating "an instrument for seeing," from Late Latin -scopium, from Greek -skopion, from skopein "to look at, examine" (from PIE root *spek- "to observe").
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-meter 
word-forming element meaning "device or instrument for measuring;" commonly -ometer, occasionally -imeter; from French -mètre, from Greek metron "a measure," from PIE root *me- (2) "to measure."
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-athon 
also -thon, word-forming element denoting prolonged activity and usually some measure of endurance, abstracted from marathon; for example walkathon (1931), skatathon (1933); talkathon (1948); telethon (1949).
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-theism 
word-forming element meaning "belief (of a specified kind) in God, a god, or gods," from Greek theos "god" (from PIE root *dhes-, forming words for religious concepts) + -ism.
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-ery 
word-forming element making nouns meaning "place for, art of, condition of, quantity of," from Middle English -erie, from Latin -arius (see -ary). Also sometimes in modern colloquial use "the collectivity of" or "an example of."
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-xion 
ending favored in British English for certain words that in U.S. typically end in -ction, such as connexion, complexion, inflexion, as being more true to the Latin rules.
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-try 
extended form of -ry sometimes used in forming modern abstract nouns, often for humorous effect, based on the many -try words where the -t- is part of the Latin stem (geometry, idolatry, industry, pedantry, etc.).
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electro- 

before vowels electr-, word-forming element meaning "electrical, electricity," Latinized form of Greek ēlektro-, combining form of ēlektron "amber" (see electric). As a stand-alone, formerly often short for electrotype, electroplate.

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dendro- 

word-forming element meaning "tree," from Greek dendron "tree," sometimes especially "fruit tree" (as opposed to hylē "timber"), from PIE *der-drew-, from root *deru- "to be firm, solid, steadfast," also forming words for "wood, tree."

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-genous 

word-forming element meaning "generating, producing, yielding;" see -gen + -ous. In modern formations, making adjectives corresponding to words in -gen. In some older words, from Late Latin -genus, from Latin -gena "born" (for example indigenous).

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