Relating to the scientific study and classification of reptiles and amphibians.
From 'herpetology' (study of reptiles) plus '-ical' (relating to). The '-ical' variant is more common in English than '-ic' for formal scientific terminology.
Scientists often use both '-ic' and '-ical' versions of words interchangeably, but '-ical' tends to feel more formal and academic—compare 'historic' to 'historical'!
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