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xylem
xylene
xylenol
xylidine
xylo-
xylogenous
xylograph
xyloid
xylol
xylophagous
xylophone
xylose
xystus
-y (1)
-y (2)
-y (3)
Y (1)
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Y chromosome
Y chromosome (plural Y chromosomes)


noun 
Definition:
 
male sex chromosome: the sex chromosome that determines the male sex in humans and other mammals. The body cells of males each possess one Y chromosome paired with one X chromosome.
See also  X chromosome
Encarta® World English Dictionary [World English Edition] © & (P)2008 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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