ˈnim(p)fəl adjective
Etymology: French, from Middle French, from nymphe nymph + -al
: of, relating to, or being a nymph : consisting of nymphs
during the nymphal period the mite may molt one or more times — Nathan Banks
the first ephemerids … crack their nymphal shucks — Richard Salmon
will result in lower nymphal populations — Biological Abstracts