12 letters · 24 points in Scrabble
adjective of birds and mammals; having constant and relatively high body temperature
originBy surface analysis, homeo- + -thermic, from the Ancient Greek ὅμοιος (hómoios, “of like kind, similar”) in conjunction with θέρμη (thérmē, “heat”), or, by surface analysis, homeotherm + -ic.
Etymology from Wiktionary, CC BY-SA 3.0