The Phrygian word *ΔΙΘΥΡ
Word *ΔΙΘΥΡ
d i tʰ u r
IPA ditʰur
Meaning four
See also Homeric Greek: τέσσαρες ‘four’
Thracian: ketri ‘four’
Proto-Indo-European: *kʷetwóres (m), kʷetwesóres (f), kʷetwōr (n) ‘four’
Latin: quattuor ‘four’
Doric Greek: *τύρτος ‘fourth’
Synonyms *ΘΙΔΡΑ-

Comments
Václav Blažek (2010)

Other words that might be of interest
ΠΙΝΚΕ ‘five’, ϝΙΤΑΡΟΝ ‘second’, ΟΤΥϝΟΙ ‘eight’