electroencephalography
ih-LEK-troh-en-SEF-uh-LOG-ruh-fee
None (medical/technical term)
the recording of the brain's electrical activity
Literally: electricity-brain-recording
| Part | Meaning | Language | Note |
|---|---|---|---|
| electro- | amber; electricity | Greek (electr, -i, -o) | combining form ending in -o-; amber was the first known source of static electricity, hence the extended meaning |
| encephalo- | the brain | Greek (encephal, -o, =us) | encephal- subsumes cephal- (head); the en- prefix means 'within', so literally 'that within the head'; connecting -o- links to -graphy |
| -graphy | recording (process) | Greek | suffix denoting a process or technique of recording; derived from graph- 'write' |
A compound noun built from three Greek elements joined by connecting vowels (-o-). 'Electro-' modifies 'encephalo-', specifying that it is the electrical signals of the brain that are being recorded. '-graphy' is the head suffix nominalizing the whole compound as a process or technique. All elements are Greek, making this a pure Greek compound. The word functions as a singular uncountable noun in English.
Pronunciation
- ih-LEK-troh-en-SEF-uh-LOG-ruh-fee Nine syllables: e-lec-tro-en-ceph-a-log-ra-phy. Penult 'ra' has a short vowel followed by a single consonant → stress falls on the antepenult 'log' by the antepenult rule. Secondary stress naturally falls on 'lec' as the first heavy syllable of the compound.
Commonly: In everyday clinical speech the same syllable LOG receives primary stress, but 'ceph' (SEF) often carries a strong secondary stress: ih-lek-troh-en-SEF-uh-log-ruh-fee — both are widely accepted.
Other readings
One could analyse encephalo- as en- ('within') + cephalo- ('head') + -graphy, but the dictionary treats encephal- as a single root meaning 'the brain', so the three-part split (electro + encephalo + graphy) is preferred.
The dictionary match for encephalo- [7-16] takes priority over the overlapping cephalo- [9-16]; encephal- is the correct root for 'brain' as a whole, while cephal- alone means only 'head'. The spurious matches (ect-, oen-, rap-, etc.) are positional coincidences inside the longer roots and carry no etymological weight here. The abbreviation EEG stands for electroencephalogram (the instrument/recording, using -graph) rather than electroencephalography (the process, using -graphy). 'Electricity' itself derives from New Latin electricus, coined from Greek ēlektron (amber), because rubbing amber produces static charge.