Tumor

google

ref

late Middle English: from Latin tumor, from tumere ‘to swell’.

wiktionary

ref

From Middle English tumour, from Old French tumour, from Latin tumor(“swelling”), from tumeō(“bulge, swell”, verb), from Proto-Indo-European *tewh₂-(“to swell”). Related to English thumb.

etymonline

ref

tumor (n.)

early 15c., from Latin tumor "swelling, condition of being swollen, a tumor," from tumere "to swell" (from PIE root *teue- "to swell").