necto-comb. form
Stress is usually determined by a subsequent element and vowels may be reduced accordingly; see e.g.
nectosome n.Origin: A borrowing from Greek. Etymons: Greek νηκτόν, νηκτός.
Etymology: < Hellenistic Greek or Byzantine Greek νηκτόν power of swimming (recorded in the Anacreontea, dated between 1st cent. b.c. or a.d. and 5th or 6th cent. a.d.; use as noun of neuter singular of ancient Greek νηκτός swimming < νήχειν to swim (cognate with classical Latin nāre : see natant adj.) + -τός , suffix forming verbal adjectives) + -o- connective. Compare nekton n.Formations are attested from the mid 19th cent. (see e.g. nectocalyx n., nectosac n.).
This is a new entry (OED Third Edition, September 2003; most recently modified version published online June 2019).