Poliocephalus
poh-lee-oh-SEF-uh-lus
Genus
the grey-headed one
Literally: grey-headed
| Part | Meaning | Language | Note |
|---|---|---|---|
| polio- | grey, ash-coloured | Greek (polios) | Greek πολιός; combining form polio- |
| -o- | connecting vowel | links the two roots | |
| -cephal- | head | Greek (cephal, -o) | from Greek κεφαλή |
| -us | nominative singular masculine ending | Latin (=us) | standard Latinisation for genus names; grammatical gender masculine |
A single compound genus name formed from two Greek roots joined by the connecting vowel -o-. Greek polios (grey) + kephalē (head) + the Latinised nominative ending -us. It functions as a masculine Latin noun. The literal meaning describes a colour characteristic of the head, a pattern typical of avian genus names coined in the 19th century.
Pronunciation
- poh-lee-oh-SEF-uh-lus Antepenult rule: the penult vowel (-a- in -pha-) is short and followed by only one consonant before a vowel, so stress falls on the antepenult syllable (-ceph-). The 'ch' in cephalus = hard 'k'; 'c' before 'e' = 's' sound, giving 'sef'.
Other readings
An alternative reading of 'polio-' as 'city' (Greek polis) is possible in principle but is ruled out by context: the genus Poliocephalus refers to grebes, and its members have conspicuously grey heads.
The connecting vowel between polio- and -cephalus is already supplied by the combining form polio-, so no additional vowel is inserted. Poliocephalus is a valid genus of grebes (family Podicipedidae); the type species is the hoary-headed grebe (Poliocephalus poliocephalus), named for the distinctive silver-grey streaking on its head. The root 'polios' (grey) is also the source of the medical prefix polio- as in poliomyelitis ('grey-marrow inflammation'), referring to the grey matter of the spinal cord.