English Words: O
15,494 words · Page 74 of 310
The third and penultimate stage of interglacial forest development (Late-Temperate), characterized by shade-tolerant species that tolerate leaching of the soil.
tissue (neuroglia) consisting of glial cells that are smaller than astrocytes and form the myelin sheath
A glioma believed to originate from the oligodendrocytes of the brain or from a glial precursor cell.
A glial cell smaller than an astrocyte, that forms the myelin sheath for many axons
That is active in small quantities; used especially to describe the sterilizing effect of some heavy metals against bacteria
an ester oligomer chain containing a small number of repeating ester units (monomers). (Oligoesters are short analogs of polymeric polyesters.)
Any of a class of aromatic polycyclic hydrocarbons consisting of several fluorene units attached end to end.
Spelling & Dictionary Insight
The English alphabetical index for the letter O contains 15,494 headwords drawn from our Wiktionary-derived dictionary table. At 50 entries per page the browse splits into 310 pages, and you are currently viewing page 74. Every row above is a dictionary-backed entry with a canonical slug, and each links through to a full definition page with pronunciation, senses, etymology, and related-word data where available.
On this page 50 of 50 entries carry a part-of-speech tag and 50 carry at least one stored definition. Coverage varies across letters because Wiktionary volunteers build entries at different speeds for different parts of the alphabet, letters with common starting sounds (S, C, T, P) usually have the densest coverage, while less frequent starters (X, Q, Z) tend to have shorter but more specialised lists. PlainSpell surfaces whatever data is present and links back to the source when a definition is not yet recorded.
For readers using this index as a spelling reference, the guarantee is that every form you see on the list is a documented English headword, not a guess, not a derived inflection lacking a lemma row. If a word you expected to find is absent from the "O" list, it usually means the form exists only as an inflection of another lemma (e.g. a past participle stored under the infinitive) or the entry has not yet been imported from Wiktionary. Use the search bar or the misspelling lookup to resolve these cases.