Of, relating to, or resembling a gazelle or gazelles; gazelle-like or characteristic of gazelles.
From 'gazelle' plus the suffix '-ine' (an adjective-forming suffix meaning 'of or relating to'), similar to words like 'feline' (of cats) and 'canine' (of dogs).
The '-ine' suffix is the sophisticated, Latinate way of making adjectives from animal names—'canine' and 'feline' are common, but 'gazelline' shows how you can apply the same pattern to any animal if you want an impressive-sounding descriptor.
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