Quick Definition
I am dying, am dead
Strong's Definition
to die (literally or figuratively)
Derivation: a strengthened form of a simpler primary (which is used for it only in certain tenses);
KJV Usage: be dead, die
Thayer's Greek Lexicon
θνῄσκω: perfect τέθνηκα, infinitive τεθνάναι and L T Tr WH τεθνηκέναι (in Act_14:19), participle τεθνηκώς; pluperfect 3 person singular ἐτεθνήκει (Joh_11:21 Rec.); (from Homer down); the Sept. for ξεΜϊ; to die; perfect to be dead: Mat_2:20; Mar_15:44; Luk_7:12 (L brackets); ; Joh_11:21, Rec. in and ; Joh_12:1 (T WH omit; L Tr brackets); Joh_19:33; Act_14:19; Act_25:19; metaph, of the loss of spiritual life: ζῶσα τέθνηκε, i. e. κἄν δοκῇ ζῆν ταύτην τήν αἰσθητην ζωήν, τέθνηκε κατά πνεῦμα (Theoph.): 1Ti_5:6 (Philo de secular § 10 ζῶντες ἔνιοι τεθνήκασι καί τεθνηκότες ζῶσι). (Compare: ἀποθνῄσκω, συναποθνῄσκω.)
Mounce Concise Greek Dictionary
θνῄσκω thnēskō 9x
to die; in NT to be dead, Mat_2:20 ; Mar_15:44
Abbott-Smith Greek Lexicon
θνήσκω ,
[in LXX chiefly for H4191 ;]
to die; pf . ( M , Pr., 114), to be dead: Mat_2:20 , Mar_15:44 , Luk_7:12 ; Luk_8:49 , Joh_11:44 ; Joh_19:33 , Act_14:19 ; Act_25:19 ; metaph ., of spiritual death, 1Ti_5:6 ( cf. ἀπο -, συν -απο -θνήσκω ).†
Liddell-Scott — Intermediate Greek Lexicon
θνήσκω [Etym: The Root is ΘΑΝ, found in aor2 θανεῖν, etc.] [Etym: The form τεθνειώς appears as a variant reading at Iliad 17.161] "to die, be dying", in aor2 and perf. "to be dead", Hom. , etc.; the pres. sometimes takes a perf. sense, θνήσκουσι γάρ, for τεθνήκασι, Soph. , Eur. often used like a pass. Verb, χερσὶν ὑπ᾽ Αἴαντος θανέειν "to fall by" his "hand, be slain by" him, Il. , etc.:—note the phrase of Dem. , τεθνᾶσι τῶι δέει τοὺς τοιούτους, where τεθνᾶσι τῶι δέει must be taken as a single Verb, "are in mortal fear of". metaph. of things, "to die, perish", Aesch. , Soph. , etc.
STEPBible — Tyndale Abridged Greek Lexicon
θνήσκω
[in LXX chiefly for מוּת ;]
to die; pf. (M, Pr., 114), to be dead: Mat.2:20, Mrk.15:44, Luk.7:12 8:49, Jhn.11:44 19:33, Act.14:19 25:19; metaphorically, of spiritual death, 1Ti.5:6 (cf. ἀπο-, συν-απο-θνήσκω).†
(AS)