English Words: O
15,494 words · Page 103 of 310
A type of laboratory mouse that has been genetically modified to carry an activated oncogene, increasing its susceptibility to cancer.
Any material, typically a protein, that regulates the onset and development of a cancer
Any of a group of RNA viruses, of the subfamily Oncornvirinae in the family Retroviridae, that cause tumors in various animals and in humans.
ischemic cell death: a process characterized by mitochondrial swelling, cytoplasm vacuolization, and swelling of the nucleus and cytoplasm
A membrane-derived microvesicle that is secreted by cancer cells and transfers oncogenic messages and protein complexes across cell borders
An embryonic form of a tapeworm, enclosed in a spherical membrane armed with six hooks
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 103. 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.