Quick Definition
πλανήτης, ου, ὁ n.m. a wanderer
Strong's Definition
from 4108; a rover ("planet"), i.e. (figuratively) an erratic teacher
KJV Usage: wandering
UBS Dictionary of the Greek New Testament
adjc. | -ου | πλανάω
15.26 · Linear Movement · Travel, Journey
wanderer (derivative of πλανάω[b] ‘to wander about,’ 15.24) one who or that which wanders about or around In JUD 1:13 there appears to be a double-entendre in that πλανήτης may also suggest the meaning of πλανάω ‘to deceive, to cause to be mistaken’ (see 31.8). Therefore, such persons may be described not only as ‘wanderers,’ but as ‘deceivers.’ For a further discussion of πλανήτης in JUD 1:13, see 1.30.
UBS Dictionary of the Greek New Testament © United Bible Societies, licensed CC BY-SA 4.0.
Thayer's Greek Lexicon
πλανήτης, -ov, ὁ, (πλανάω), a wanderer: ἀστέρες πῖλος ται, wandering stars (Aristot., Plut., al.), Jude 13 [where WH mrg. dor. πλάνητες (Xen. mem. 4, 7, 5)]; see ἀστήρ, fin.
Mounce Concise Greek Dictionary
πλανήτης planētēs 1x
a rover, roving, a wanderer, wandering; ἀστὴρ πλανήτης, a wandering star, Jude 13*
Abbott-Smith Greek Lexicon
πλανήτης, -ου, ὁ
(< πλανάω), [in LXX: Ho 9:17 (נדד)*;]
= πλάνης, a wanderer: ἀστέρες π. (cl. planets), wandering stars, Ju 13 (WH, mg., -τες).†
Moulton & Milligan — Vocabulary of the Greek NT
πλανήτης. For the ordinary use οἵ πλανήτης, ““ planet,” cf. the magic P Lond 121°! (iii/A.D.) (=I. p. 100) γεννήσας τοὺς € πλανήτας ἀστέρας of εἰσιν οὐρανοῦ σπλάγχνα Kal γῆς ἔντερα καὶ ὕδατος χύσις καὶ πυρὸς θράσος, and P Eud™ (cited by Mayser Gr. p. 441). In Jude 13, on the other hand, the imagery is clearly derived from Enoch (especially 1814}, and the reference is to ‘‘ wandering stars,” stars which have left their appointed orbits: see further Mayor Comm, ad !.
Liddell-Scott-Jones — Greek-English Lexicon
πλανήτης (planētēs) — wandering. πλᾰν-ήτης, ου, Doric dialect πλανάτας, ὁ, ={πλάνης} 1.1, [Refs 5th c.BC+]; τοὺς π. ἐπὶ τὰς πόλεις ἐμπόρους [καλοῦμεν] [Refs 5th c.BC+]; πλανῆται ἐπὶ πάντας τόπους, of hares, [Refs 5th c.BC+]
II. as adjective, π. ἄθλιος βίος [Refs 5th c.BC+]
II.2. in Medicine texts, ={πλάνης}[Refs 2nd c.AD+]