Etymology
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Words related to ornithology

ornitho- 

before vowels ornith-, word-forming element meaning "bird, birds," from combining form of Greek ornis (genitive ornithos; plural ornithēs) "a bird," in Attic generally "domestic fowl, cock or hen," which often was added to the specific name of the type of bird, from PIE *or- "large bird" (see erne).

For "bird" Greek also had ptēnon (plural peteina), related to pteron "wing," from the root meaning "to fly."

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-logy 

word-forming element meaning "a speaking, discourse, treatise, doctrine, theory, science," from Greek -logia (often via French -logie or Medieval Latin -logia), from -log-, combining form of legein "to speak, tell;" thus, "the character or deportment of one who speaks or treats of (a certain subject);" from PIE root *leg- (1) "to collect, gather," with derivatives meaning "to speak (to 'pick out words')." Often via Medieval Latin -logia, French -logie. In philology "love of learning; love of words or discourse," apology, doxology, analogy, trilogy, etc., Greek logos "word, speech, statement, discourse" is directly concerned.

ornithological (adj.)

"of or pertaining to ornithology, relating to the study of birds," 1763, from ornithology + -ical. Related: Ornithologically.

ornithologist (n.)

"one who makes a special study of birds," 1670s, from ornithology + -ist.