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alto clef
alto-relievo
altocumulus
altogether
altoist
Alton
Altoona
altostratus
altricial
altruism
ALU
alu
alu sequence family
alula
alum (1)
alum (2)
alumina
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altricial

al·tri·cial [ al tríshəl ]


adjective 
Definition:
 
helpless and dependent: describes birds or mammals that are helpless when young and dependent on their parents for food



noun  (plural al·tri·cials)
Definition:
 
animal producing helpless young: a bird or mammal that produces young that are unable to move or feed themselves without help

[Late 19th century. < modern Latin Altrices (former division of birds), plural of Latin altrix "female nourisher" < alere "nourish"]
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