| Definition/Meaning | Word/Phrase |
| large blue-grey black-striped damselfish; nearly worldwide |
Abudefduf saxatilis
,
sergeant major
|
| any of various usually poisonous plants of the genus Aconitum having tuberous roots and palmately lobed leaves and blue or white flowers |
aconite
|
| poisonous herb native to northern Europe having hooded blue-purple flowers; the dried leaves and roots yield aconite |
Aconitum napellus
,
helmet flower
,
helmetflower
,
monkshood
|
| woolly-stemmed biennial arborescent shrub of tropical Africa and southern Asia having silvery-white prickly branches, clusters of blue or white flowers, and bright red berries resembling holly berries |
African holly
,
Solanum giganteum
|
| African plant with bright green evergreen leaves and umbels of many usually deep violet-blue flowers |
African lily
,
African tulip
,
Agapanthus africanus
,
blue African lily
|
| any of various plants of the genus Agapanthus having umbels of showy blue to purple flowers |
agapanthus
,
lily of the Nile
|
| any plant of the genus Ageratum having opposite leaves and small heads of blue or white flowers |
ageratum
|
| small tender herb grown for its fluffy brushlike blue to lavender blooms |
Ageratum houstonianum
,
common ageratum
|
| rhizomatous plant of central and southeastern United States and West Indies having large showy heads of clear blue flowers; sometimes placed in genus Eupatorium |
ageratum
,
Conoclinium coelestinum
,
Eupatorium coelestinum
,
mist-flower
,
mistflower
|
| blue flower |
ageratum
,
cornflower
,
larkspur
,
scilla
|
| gentian of eastern North America having clusters of bristly blue flowers |
ague weed
,
agueweed
,
five-flowered gentian
,
Gentiana quinquefolia
,
Gentianella quinquefolia
,
stiff gentian
|
| upright rhizomatous perennial with bright blue flowers; southern Europe |
Ajuga genevensis
,
blue bugle
,
erect bugle
|
| low rhizomatous European carpeting plant having spikes of blue flowers; naturalized in parts of United States |
Ajuga reptans
,
creeping bugle
|
| small kingfisher with greenish-blue and orange plumage |
Alcedo atthis
,
Eurasian kingfisher
|
| important European leguminous forage plant with trifoliate leaves and blue-violet flowers grown widely as a pasture and hay crop |
alfalfa
,
lucerne
,
Medicago sativa
|
| any of various water-soluble compounds capable of turning litmus blue and reacting with an acid to form a salt and water |
alkali
,
base
|
| perennial or biennial herb cultivated for its delicate usually blue flowers |
alkanet
,
Anchusa officinalis
,
bugloss
|
| deciduous creeping shrub bright red in autumn having black or blue-black berries; alpine and circumpolar |
alpine bearberry
,
Arctostaphylos alpina
,
black bearberry
|
| fish with a dark-blue back and whitish sides with red stripes; found in swamps and streams of Florida |
American flagfish
,
flagfish
,
Jordanella floridae
|
| tree or large shrub with grey bark and blue-green leaves that turn red-orange in autumn |
American hornbeam
,
Carpinus caroliniana
|