Etymology
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phono- 

word-forming element meaning "sound, voice," from Greek phōno-, combining form of phōnē "voice, sound" of a human or animal, also "tone, voice, pronunciation, speech" (from PIE root *bha- (2) "to speak, tell, say").

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-phone 

word-forming element meaning "voice, sound," also "speaker of," from Greek phōnē "voice, sound" of a human or animal, also "tone, voice, pronunciation, speech," from PIE root *bha- (2) "to speak, say, tell" (source also of Latin for, fari "to speak," fama "talk, report").

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-pathic 
word-forming element from Latin pathicus, from Greek pathikos "suffering, remaining passive," from pathein "to suffer" (from PIE root *kwent(h)- "to suffer").
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-ful 
word-forming element attached to nouns (and in modern English to verb stems) and meaning "full of, having, characterized by," also "amount or volume contained" (handful, bellyful); from Old English -full, -ful, which is full (adj.) become a suffix by being coalesced with a preceding noun, but originally a separate word. Cognate with German -voll, Old Norse -fullr, Danish -fuld. Most English -ful adjectives at one time or another had both passive ("full of x") and active ("causing x; full of occasion for x") senses.

It is rare in Old English and Middle English, where full was much more commonly attached at the head of a word (for example Old English fulbrecan "to violate," fulslean "to kill outright," fulripod "mature;" Middle English had ful-comen "attain (a state), realize (a truth)," ful-lasting "durability," ful-thriven "complete, perfect," etc.).
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