[TA]Do not confuse this word with external or outer. (1) On the side. SYN: lateralis [TA]. (2), Farther from the median or midsagittal plane. SYN: lateralis [TA]. (3) In dentistry, a position either right or left of the midsagittal plane. (4) A radiographic projection made with the film in the sagittal plane; especially, the second view of a chest series. SYN: lateralis [TA]. [L. lateralis, lateral, fr. latus, side]