9-letter words starting with on
- one-horse — using or having only a single horse: a one-horse carriage.
- one-liner — a brief joke or amusing remark.
- one-owner — that has only had one owner
- one-piece — complete in one piece, as a garment: a one-piece snowsuit.
- one-sided — considering but one side of a matter or question; partial or unfair: a one-sided judgment.
- one-track — having only one track.
- one-woman — used, operated, performed, etc., by one woman: a one-woman show.
- onega bay — a bay in the NW Russian Federation in Europe, at the SW end of the White Sea. 100 miles (160 km) long.
- onerosity — burdensome, oppressive, or troublesome; causing hardship: onerous duties.
- onerously — In an onerous manner.
- oniomania — an uncontrollable desire to buy things.
- onion fly — a small grey dipterous insect, Delia antiqua, that is a serious pest of onions. The larvae destroy the bulbs
- onionlike — Resembling an onion or some aspect of one, such as its shape, flavour, or layered structure.
- onionskin — a thin, lightweight, translucent, glazed paper, used especially for making carbon copies.
- onlookers — Plural form of onlooker.
- onlooking — looking on; observing; perceiving.
- only just — by slight margin
- onomastic — of or relating to proper names.
- onomatope — (linguistics) A word formed by onomatopoeia or mimesis.
- onondagan — a member of a tribe of Iroquoian Indians formerly inhabiting the region of Onondaga Lake.
- onopordum — (botany) Any of the genus Onopordum of asteraceous thistles.
- onrushing — Rushing or flowing forward.
- onsetting — the action of attacking or assaulting
- onshoring — the practice of employing white-collar workers from abroad
- onslaught — an onset, assault, or attack, especially a vigorous one.
- ontically — In an ontic sense.
- ontogenic — the development or developmental history of an individual organism.
- ontologic — of or relating to ontology, the branch of metaphysics that studies the nature of existence or being as such; metaphysical: Some of the U.S. founders held an ontological belief in natural rights.