n. & v. (also phantasy)
n. (pl. -ies) 1 the faculty of inventing images, esp. extravagant or visionary ones. 2 a fanciful mental image; a day-dream. 3 a whimsical speculation. 4 a fantastic invention or composition; a fantasia.
v.tr. (-ies, -ied) imagine in a visionary manner.
[ ME f. OF fantasie f. L phantasia appearance f. Gk (as FANTAST) ]