βαΐς

From LSJ

τὸν νέον τίνα οἴει καρδίαν ἴσχειν → what do you think are his feelings

Source

German (Pape)

[Seite 426] ἡ, Palmenzweig, Hesych. S. βαΐον.

Frisk Etymological English

ιν
Grammatical information: f.
Meaning: palm leaf (LXX, Pap.),
Other forms: βάϊον n. id.; also measure (Ev. Jo., Pap.).
Derivatives: Adj. βαϊνός (Sm.) of palm leaf, βαινή f. branch of a palm (LXX).
Origin: LW [a loanword which is (probably) not of Pre-Greek origin]
Etymology: From Eg. b`j, Copt. bai; s. Hemmerdinger, Glotta 46 (1968) 245f..