furthermore

From Middle English furthermore, forthermore, forthermar (also as forther mo), equivalent to further +‎ -more.

• (UK) IPA^(key): /ˈfɜː(ɹ).ðə(ɹ)ˌmɔː(ɹ)/
• (US) IPA^(key): /ˈfɝ.ðɚˌmɔɹ/

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furthermore (not comparable)

1. In addition; besides; further; what's more (i.e. to denote additional information).

   He skillfully took charge of the event, and furthermore, he stayed late after it to clean up.

   He claimed further(more) that he was not even in town the day the murder occured.

   • 1854 July, “Obstacles to Revivals”, in The Freewill Baptist Quarterly, volume 2, page 306:

     But, furthermore, the true Revival of pure Religion, is meeting at this day a still more fearful obstacle, in the system of go-betweenity or theological mermaidism, which has arisen out of the ashes of old defunct infidelity, and is boasting its able champions.

   • 2013 July-August, Philip J. Bushnell, “Solvents, Ethanol, Car Crashes & Tolerance”, in American Scientist:

     Surprisingly, this analysis revealed that acute exposure to solvent vapors at concentrations below those associated with long-term effects appears to increase the risk of a fatal automobile accident. Furthermore, this increase in risk is comparable to the risk of death from leukemia after long-term exposure to benzene, another solvent, which has the well-known property of causing this type of cancer.

• additionally
• also
• moreover
• what is more

furthermore

1. (rare) comparative form of further: more further; the more especially forward, ahead or (figurative) progressed