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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)

amiga
nounLow
/əˈmiːɡə/A female friend; a close female companion.
amigo
nounLow
/əˈmiːɡəʊ/A friend; especially used as a term of address for a male friend.
amikacin
nounVery Low
/ˌamɪˈkeɪsɪn/A broad-spectrum antibiotic derived from kanamycin, used to treat serious bacterial infections.
amiloride
nounSpecialized
/əˈmɪl.ə.raɪd/A potassium-sparing diuretic medication used to treat high blood pressure and heart failure.
amimia
nounExtremely rare / Technical
/eɪˈmɪmiə/A medical/neurological condition characterized by the inability to express ideas through gestures or signs, or the loss of the ability to mimic gestures.
amin
nounMedium
/ɑːˈmɛn/, /ˈeɪ.mɛn/A word used at the end of a prayer or hymn, meaning "so be it" or "truly," expressing agreement, affirmation, or solemn ratification.
aminah
nounVery Low
/ɑːˈmiːnə/A given name, predominantly of Arabic origin, meaning 'trustworthy', 'faithful', or 'safe'.
aminase
nounVery Low
/ˈæmɪneɪz/An enzyme that catalyzes the transfer of an amino group from one molecule to another.
aminate
verb-transitiveLow (C2/Technical)
/ˈæm.ɪ.neɪt/To introduce an amino group (-NH₂) into a compound.
amindivi islands
nounVery Low
/ˌæmɪnˈdiːvi ˈaɪləndz/A group of islands in the Arabian Sea, part of the Lakshadweep archipelago, located off the southwestern coast of India.
amine
combining-formnounC2
/ˈeɪ.miːn/An organic compound derived from ammonia by replacement of one or more hydrogen atoms with hydrocarbon groups.
amino acid
nounC1
/əˌmiːnəʊ ˈæs.ɪd/One of the organic molecules that serve as the building blocks of proteins.
amino acid sequence
nounC2
/əˌmiː.nəʊ ˈæs.ɪd ˈsiː.kwəns/The specific order of amino acids linked together in a protein or peptide chain.
amino group
nounC2
/əˌmiːnəʊ ˈɡruːp/A functional group in chemistry consisting of a nitrogen atom bonded to two hydrogen atoms (-NH₂).
amino resin
nounC2
/əˌmiːnəʊ ˈrɛzɪn/A synthetic resin made by condensing amines with aldehydes.
amino-acid dating
nounC1
/əˌmiːnəʊ ˌæsɪd ˈdeɪtɪŋ/A scientific method for determining the age of organic materials by measuring the chemical changes in their amino acids.
aminoacetic acid
nounC2 (Highly Technical/Very Low Frequency)
/əˌmiːnəʊəˈsiːtɪk ˈæsɪd/The simplest amino acid with the chemical formula NH₂CH₂COOH, which serves as a building block for proteins and is a component of many biological systems.
aminoaciduria
nounVery Low
/əˌmiːnəʊˌæsɪˈdjʊərɪə/The presence of an excess of amino acids in the urine.
aminobenzene
nounC2
/ˌæmɪnəʊˈbɛnziːn/The simplest aromatic amine; an organic compound consisting of a benzene ring attached to an amino group (-NH₂).
aminobenzoic acid
nounlow
/əˌmiːnəʊbɛnˈzəʊɪk ˈæsɪd/A chemical compound consisting of a benzoic acid molecule with an amino group attached; primarily referring to two isomers (ortho-, para-) used in organic synthesis, dye production, and some biological functions.

Showing 4061–4080 of 8734 words.