Usage: 2 forms in 6 verses
Form Translated As     In Verse(s)
μάντιν clairvoyant LXX.Josh.13.22
μάντεισ clairvoyants LXX.1Sam.6.2LXX.Mic.3.7LXX.Zech.10.2
her clairvoyants LXX.Jer.50.36
your clairvoyants LXX.Jer.29.8

Liddell-Scott-Jones

μάντις (mantis) a clairvoyant G:N-M

μάντις, ,

genitive εως, Ionic dialect ιος; vocative μάντῐ: plural, genitive μάντεων (written μαντειον [Refs]; dative μάντεσι [Refs 6th c.BC+]; nominative plural μάντιδες Suid. see at {Σίβυλλα}:— diviner, seer, prophet, ἀλλ᾽ ἄγε δή τινα μ. ἐρείομεν ἱερῆα καὶ ὀνειροπόλον [Refs 8th c.BC+]; μάντι κακῶν prophet of ill, [Refs 8th c.BC+]; with the Greek armies, [Refs 5th c.BC+]; of Apollo, [Refs 4th c.BC+]; μάντις μάντιν ἐκπράξας ἐμέ, of Apollo and Cassandra, [Refs]; of the Pythian priestess, [Refs]; of Amphiaraus, [Refs 5th c.BC+]

__2 metaphorically, presager, foreboder, μ. εἴμ᾽ ἐσθλῶν ἀγώνων [Refs 5th c.BC+]
__3 adjective, τοῦδε μάντεως χοροῦ of this prophetic band, uncertain in [Refs 5th c.BC+]
__II a kind of grasshopper, the praying mantis, Mantis religiosa, [Refs 3rd c.BC+]
__III green garden-frog, Rana arborea, so called as predicting the weather, [Refs 5th c.AD+]
__IV a kind of cabbage, [Refs 2nd c.BC+]
__V applied to comets, [Refs 5th c.BC+]