Vincent's NT Word Studies
3. A pound (litran). Only here and xix. 39. Matthew and Mark, ajlabastron, a flask.Of spikenard (nardou pistikhv). So Mark. See on Mark xiv. 3.
Very precious (polutimou). Literally, of much value. Matthew has barutimou, of weighty value.
Anointed. See on xi. 2.
Feet. The Synoptists mention only the pouring on the head.