perímetro
/peˈɾimetɾo/ · B2 · noun · m
margin
📏 Greek peri (around) + metron (measure) = the measure around
Same roots as periscope and metre. Note the stress falls on the second syllable: pe-RÍ-me-tro, not like English PE-ri-meter. Like most words ending in -o, it is masculine: el perímetro.