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polar bear
polar body
polar cap
polar circle
polar coordinates
polar distance
polar equation
polar front
polar nucleus
polar star
polar wandering
polarimeter
Polaris
polariscope
polarise
polarity
polarity therapy
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polar nucleus
po·lar nu·cle·us (plural po·lar nu·cle·i or po·lar nu·cle·us·es)


noun 
Definition:
 
nucleus in plant embryo: either of the two nuclei in the center of the sac of a seed plant embryo that eventually fuse into the endosperm
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