ˌ ̷ ̷ ̷ ̷ at hydro- +ˈme.trəˌdē noun plural
Usage: capitalized
Etymology: New Latin, from Hydrometra, type genus (from hydr- + -metra, from Greek metrein to measure, traverse, from metron measure) + -idae — more at measure
: a family of small slender long-legged semiaquatic bugs closely related to the water striders