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English Words Starting With A

8,734 entries — pick a word to see its definition, pronunciation, and usage.

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Noun Verb Adjective Adverb Plural noun Combining form Verb (transitive)Verb (intransitive)Verb (ambitransitive)

altrices
plural-nounVery Low
/ælˈtraɪsiːz/A taxonomic class of birds that are born helpless and require extensive parental care after hatching.
altricial
adjectivenounlow
/ælˈtrɪʃəl/Of a newborn animal: born helpless and requiring significant parental care.
altrincham
nounC2 (Proper noun with very specific geographic reference)
/ˈɒltrɪŋəm/A market town in Greater Manchester, England, historically part of Cheshire.
altruism
nounC1
/ˈæl.tru.ɪ.zəm/The principle and practice of concern for the well-being and happiness of others, often at a cost to oneself.
altruist
nounC1
/ˈæl.tru.ɪst/a person who cares about others' well‑being and acts to help them, often at personal cost
altus
nounVery Low
/ˈæl.təs/high, deep, or lofty (from Latin)
aludel
nounVery Low (Archaic / Technical Historical)
/ˈæljʊdɛl/A pear-shaped, open-ended earthenware tube used in sublimation processes, particularly in early chemistry and alchemy.
alula
nounVery Low (Technical/Specialized)
/ˈaljʊlə/A small, movable feathered structure found on the leading edge of a bird's wing, sometimes called the 'bastard wing'.
alum
nounMedium (common in institutional/educational contexts, informal in material sense).
/ˈæl.əm/ (for the chemical), /əˈlʌm.nəs/ (for alumnus; alum rarely used)A person who has graduated or attended a particular school, college, or university (from Latin alumnus/alumna, meaning 'foster child' or 'pupil').
alum rock
nounLow
/ˈæl.əm ˌrɒk/A naturally occurring mineral consisting of hydrated double sulfate of aluminum and potassium, often found in volcanic regions.
alumina
nounC1/C2
/əˈluːmɪnə/A white, crystalline, inorganic compound of aluminum and oxygen (Al₂O₃), which is the principal component of bauxite and is used in producing aluminum metal and as an abrasive and refractory material.
alumina cement
nounC2
/əˈluːmɪnə sɪˈmɛnt/A type of cement that has a high alumina content and is known for its rapid hardening and high-temperature resistance.
aluminate
nounLow (C2)
/ˈaljʊmɪneɪt/A chemical compound containing an anion of aluminum and oxygen.
aluminite
nounVery Low
/əˈluːmɪnaɪt/A specific mineral, a hydrous aluminium sulfate.
aluminium
nounB2
/ˌæl.əˈmɪn.i.əm/A lightweight, silvery-white metallic element, used extensively for making tools, packaging, and structural components.
aluminium bronze
nounLow/C2 (Technical)
/ˌæl.ʊˈmɪn.i.əm brɒnz/A strong, corrosion-resistant alloy of copper with aluminium as the principal additive.
aluminium hydroxide
nounC1
/ˌæl.əˈmɪn.i.əm haɪˈdrɒk.saɪd/A white, powdery, inorganic compound with the chemical formula Al(OH)₃, formed when aluminium reacts with water or bases.
aluminium oxide
nounB2
/ˌæl.jʊˈmɪn.i.əm ˈɒk.saɪd/A chemical compound formed from aluminium and oxygen, with the formula Al₂O₃.
aluminium sulphate
nounC2
/ˌæl.ʊˌmɪn.i.əm ˈsʌl.feɪt/A white crystalline chemical compound with the formula Al₂(SO₄)₃, used primarily in water purification and as a mordant in dyeing.
aluminize
verbverb-transitiveC1/C2
/əˈluːmɪnaɪz/To coat or treat a surface with a layer of aluminium.

Showing 3661–3680 of 8734 words.