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From Biology-Online Dictionary
1. To look with fixed eyes wide open, as through fear, wonder, surprise, impudence, etc.; to fasten an earnest and prolonged gaze on some object.
2. To be very conspicuous on account of size, prominence, colour, or brilliancy; as, staring windows or colours.
3. To stand out; to project; to bristle.
Synonym: To gaze, to look earnestly.