- frontal (adj.)
[frontal 词源字典]
- "being in front," 1650s, of the forehead; 1971 with reference to the naked standing body; from Modern Latin frontalis, from front-, stem of Latin frons "brow, forehead" (see front (n.)). In some uses probably from front (n.) + adjectival suffix -al (1).[frontal etymology, frontal origin, 英语词源]