əˈnadrəməs, aˈn- adjective
Etymology: Greek anadromos running upward, from anadramein to run upward, from ana- + dramein to run — more at tread
1. of fish : ascending rivers from the sea at certain seasons for breeding
salmon and shad are anadromous
— compare catadromous
2. also an·a·drom·ic |anə|drämik
[ anadromic from Greek anadrom os + English -ic ]
: having the first set of veins arising on the upper side of the midrib toward the tip — used of the pinnae of a fern frond