ge·om·e·ter \jēˈäməd.ə(r), -ətə- also ÷ ˈjäm-\noun Etymology: Middle English, from Middle French or Latin; Middle French geometre, from Latin geometres, geometra, from Greek geōmetrēs, from geōmetrein to measure or survey land — more at geometry 1.: a specialist in geometry 2.: a moth or moth larva of the family Geometridae : looper