Standard Lemma guide
Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.
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noun
The boss of a shield, at or near the middle and usually projecting, sometimes in a sharp spike.
Definition source: English Wiktionary via Wiktextract
Usage: historical
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
noun
A boss, or rounded elevation, or a corresponding depression, in a palate, disk, or membrane.
An inward projection of the tympanic membrane of the ear.
Definition source: English Wiktionary via Wiktextract
Topics: anatomy, biology, medicine, natural-sciences, sciences
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
noun
A boss, or rounded elevation, or a corresponding depression, in a palate, disk, or membrane.
One of the lateral prominences just above the hinge of a bivalve shell.
Definition source: English Wiktionary via Wiktextract
Topics: biology, natural-sciences, zoology
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
noun
A boss, or rounded elevation, or a corresponding depression, in a palate, disk, or membrane.
A bump or protrusion on the cap of a mushroom or toadstool.
Definition source: English Wiktionary via Wiktextract
Topics: biology, mycology, natural-sciences
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
noun
a slight rounded elevation where the malleus attaches to the eardrum
Definition source: Princeton WordNet 3.0
No example sentence was provided for this meaning.
Synonyms: none provided
Antonyms: none provided
Broader terms: convex shape, convexity
History
Borrowed from Latin umbō (“a shield boss”). Doublet of umbone.
