òòlù noun /òò.lù/
Definitions
  1. hammer, mallet
Etymology
Contraction of òlìlù, from ò- (“nominalizing prefix”) + lílù (“partial reduplication of lù to beat”)
Component words
ò-nominalizing prefixlílùpartial reduplication of lù to beat
Source: Wiktionary, where this word is spelled “oolu”. Reference: en-oolu-yo-noun-RYyA1bjO