The word 'thyme' has a direct lineage from the Ancient Greek 'thymon', which referred to the herb or a related substance used as incense. This term is believed to be derived from the Greek verb 'thyein', meaning 'to burn, to make a burnt offering', likely because the herb was commonly used as incense in ancient sacrifices due to its strong, pleasant aroma when burned. The word passed into Latin as 'thymum', was adopted into Old French as 'thym', and finally entered Middle English, retaining its core association with the fragrant plant. The modern spelling with the silent 'h' reflects its classical origins, while its pronunciation merged with the common English word 'time'.

The entire word 'thyme' is a simplex loanword. It originates from the Greek 'thymon', which was borrowed into Latin as 'thymum', and entered English via Old French 'thym'.